A169955 - OEIS

A169955

Number of tau-isomorphism classes of spherical bitrades with |T0| = n.

1, 0, 3, 1, 6, 9, 30, 51, 198, 470, 1623, 4830, 16070, 51948, 175047, 588120, 2015226, 6933048, 24123941, 84428820, 297753519

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OFFSET

4,3

LINKS

Ales Drapal, Carlo Hamalainen and Dan Rosendorf, An enumeration of spherical latin bitrades, arXiv:0907.1376 [math.CO], Sep 16 2009.

Carlo Hamalainen, Enumeration of spherical bitrades, archive of C++ code, Sept 15, 2009.

CROSSREFS

KEYWORD

nonn

AUTHOR

EXTENSIONS

Offset corrected and a(4)-a(5) added by Hugo Pfoertner, Aug 11 2017

STATUS

approved