Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).
%I #4 Jul 10 2011 18:21:39
%S 0,0,46080,8707262054400,9325207163130772193280000,
%T 282114820702333003219864073866838016000000,
%U 519832475166470446526522688211309314023066144499302400000000000
%N Number of complete games of n X n tic-tac-toe ending in a draw.
%H J. Ferry, <a href="http://ladybug.xs4all.nl/arlet/puzzles/solutions/contrib/tictactoe.html">n X n tic-tac-toe</a> (Mathematica programs followed by results)
%H <a href="/index/Th#TTT">Index entries for sequences related to tic-tac-toe</a>
%Y Cf. A061526, A061527, A061528, A061530.
%K nonn
%O 1,3
%A Jim Ferry (jferry(AT)alum.mit.edu), May 04 2001