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Number of tau-isomorphism classes of spherical bitrades with |T0| = n.
1

%I #15 Aug 12 2017 02:48:42

%S 1,0,3,1,6,9,30,51,198,470,1623,4830,16070,51948,175047,588120,

%T 2015226,6933048,24123941,84428820,297753519

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

%H Ales Drapal, Carlo Hamalainen and Dan Rosendorf, <a href="http://arxiv.org/abs/0907.1376">An enumeration of spherical latin bitrades</a>, arXiv:0907.1376 [math.CO], Sep 16 2009.

%H Carlo Hamalainen, <a href="https://bitbucket.org/carlohamalainen/spherical/src">Enumeration of spherical bitrades</a>, archive of C++ code, Sept 15, 2009.

%Y Cf. A007083, A167123.

%K nonn

%O 4,3

%A _N. J. A. Sloane_, Aug 01 2010

%E Offset corrected and a(4)-a(5) added by _Hugo Pfoertner_, Aug 11 2017