Revision History for A098702
(Underlined text is an addition;
strikethrough text is a deletion.)
Showing all changes.
|
| |
| |
| |
|
|
#8 by Susanna Cuyler at Thu May 31 21:38:06 EDT 2018
| |
| |
| |
|
|
#7 by Joerg Arndt at Thu May 31 13:30:59 EDT 2018
| |
| |
| |
|
|
#6 by Michel Marcus at Thu May 31 13:24:05 EDT 2018
| |
| |
| |
|
|
#5 by Michel Marcus at Thu May 31 13:24:01 EDT 2018
|
|
| REFERENCES
|
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.
|
|
| LINKS
|
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.
|
|
| STATUS
|
approved
editing
|
| |
| |
|
|
#4 by Russ Cox at Fri Mar 30 16:50:03 EDT 2012
|
|
| AUTHOR
|
_N. J. A. Sloane (njas(AT)research.att.com), _, Nov 05 2004
|
| |
|
|
Discussion
|
| Fri Mar 30
| 16:50
| OEIS Server: https://oeis.org/edit/global/110
|
| |
| |
|
|
#3 by N. J. A. Sloane at Fri Feb 27 03:00:00 EST 2009
|
|
| EXAMPLE
|
Example: the Fano plane is the only 7_3 configuration, and it is self-polar.
|
|
| KEYWORD
|
nonn,nice,hard,new
|
|
| AUTHOR
|
N. J. A. Sloane (njas, (AT)research.att.com), Nov 05 2004
|
| |
| |
|
|
#2 by N. J. A. Sloane at Fri Feb 24 03:00:00 EST 2006
|
|
| DATA
|
0, 0, 0, 0, 0, 0, 1, 1, 3, 10, 25, 95, 365, 1432, 5799, 24092, 102413, 445363, 1991320
|
|
| REFERENCES
|
M. Boben et al., Small triangle-free configurations of points and lines, Discrete Comput. Geom., 35 (2006), 405-427.
|
|
| KEYWORD
|
nonn,nice,hard,new
|
| |
| |
|
|
#1 by N. J. A. Sloane at Sun Feb 20 03:00:00 EST 2005
|
|
| NAME
|
Number of self-polar configurations of type (n_3).
|
|
| DATA
|
0, 0, 0, 0, 0, 0, 1, 1, 3, 10, 25, 95, 365, 1432, 5799, 24092, 102413, 445363
|
|
| OFFSET
|
1,9
|
|
| REFERENCES
|
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.
|
|
| EXAMPLE
|
Example: the Fano plane is the only 7_3 configuration, and it is self-polar.
|
|
| CROSSREFS
|
Cf. A001403, A023994.
|
|
| KEYWORD
|
nonn,nice,hard
|
|
| AUTHOR
|
njas, Nov 05 2004
|
|
| EXTENSIONS
|
a(1)-a(18) from the Betten, Brinkmann and Pisanski article.
a(19) from the Pisanski et al. article.
|
|
| STATUS
|
approved
|
| |
| |
|
|
