Revision History for A098702
(Underlined text is an addition;
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#8 by Susanna Cuyler at Thu May 31 21:38:06 EDT 2018
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#7 by Joerg Arndt at Thu May 31 13:30:59 EDT 2018
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#6 by Michel Marcus at Thu May 31 13:24:05 EDT 2018
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#5 by Michel Marcus at Thu May 31 13:24:01 EDT 2018
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| REFERENCES
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A. Betten, G. Brinkmann and T. Pisanski, Counting symmetric configurations v_3, Discrete Appl. Math., 99 (2000), 331-338.
M. Boben et al., Small triangle-free configurations of points and lines, Discrete Comput. Geom., 35 (2006), 405-427.
Pisanski, T.; Boben, M.; Marusic, D.; Orbanic, A.; and Graovac, A. The 10-cages and derived configurations. Discrete Math. 275 (2004), 265-276.
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| LINKS
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A. Betten, G. Brinkmann and T. Pisanski, <a href="https://doi.org/10.1016/S0166-218X(99)00143-2">Counting symmetric configurations v_3</a>, Discrete Appl. Math., 99 (2000), 331-338.
M. Boben et al., <a href="https://doi.org/10.1007/s00454-005-1224-9">Small triangle-free configurations of points and lines</a>, Discrete Comput. Geom., 35 (2006), 405-427.
T. Pisanski, M. Boben, D. Marušic, A. Orbanic, A. Graovac, <a href="https://doi.org/10.1016/S0012-365X(03)00110-9">The 10-cages and derived configurations</a>, Discrete Math. 275 (2004), 265-276.
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| STATUS
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approved
editing
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#4 by Russ Cox at Fri Mar 30 16:50:03 EDT 2012
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| AUTHOR
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_N. J. A. Sloane (njas(AT)research.att.com), _, Nov 05 2004
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Discussion
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Fri Mar 30
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| OEIS Server: https://oeis.org/edit/global/110
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#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009
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| EXAMPLE
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Example: the Fano plane is the only 7_3 configuration, and it is self-polar.
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| KEYWORD
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nonn,nice,hard,new
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| AUTHOR
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N. J. A. Sloane (njas, (AT)research.att.com), Nov 05 2004
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#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006
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| DATA
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0, 0, 0, 0, 0, 0, 1, 1, 3, 10, 25, 95, 365, 1432, 5799, 24092, 102413, 445363, 1991320
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| REFERENCES
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M. Boben et al., Small triangle-free configurations of points and lines, Discrete Comput. Geom., 35 (2006), 405-427.
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| KEYWORD
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nonn,nice,hard,new
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#1 by N. J. A. Sloane at Sun Feb 20 03:00:00 EST 2005
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| NAME
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Number of self-polar configurations of type (n_3).
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| DATA
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0, 0, 0, 0, 0, 0, 1, 1, 3, 10, 25, 95, 365, 1432, 5799, 24092, 102413, 445363
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| OFFSET
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1,9
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| REFERENCES
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A. Betten, G. Brinkmann and T. Pisanski, Counting symmetric configurations v_3, Discrete Appl. Math., 99 (2000), 331-338.
Pisanski, T.; Boben, M.; Marusic, D.; Orbanic, A.; and Graovac, A. The 10-cages and derived configurations. Discrete Math. 275 (2004), 265-276.
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| EXAMPLE
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Example: the Fano plane is the only 7_3 configuration, and it is self-polar.
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| CROSSREFS
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Cf. A001403, A023994.
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| KEYWORD
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nonn,nice,hard
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| AUTHOR
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njas, Nov 05 2004
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| EXTENSIONS
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a(1)-a(18) from the Betten, Brinkmann and Pisanski article.
a(19) from the Pisanski et al. article.
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| STATUS
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approved
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