%I #9 Feb 19 2023 17:12:10
%S 1,24,255168,15038733958272,12123953291699459229254400,
%T 317158792989363996690190881249911852582400,
%U 550923875790150163780873329493220621458883503713639780465715200
%N Number of complete games of n X n tic-tac-toe.
%C The sequence is bounded above by (n^2)!, the number of games of n X n tic-tac-toe that do not stop when a player wins.
%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 Sean A. Irvine, <a href="https://github.com/archmageirvine/joeis/blob/master/src/irvine/oeis/a061/A061526.java">Java program</a> (github)
%H <a href="/index/Th#TTT">Index entries for sequences related to tic-tac-toe</a>
%Y Cf. A008907, A048245, A048246, A061527, A061528, A061529, A061530.
%K nonn
%O 1,2
%A Jim Ferry (jferry(AT)alum.mit.edu), May 04 2001