%I #16 Aug 23 2018 17:06:26
%S 0,0,0,0,0,21,21,58,23,15
%N Number of distinct terminal tic-tac-toe positions after n plays, up to rotation and reflection.
%C As in chess, a "play" is an action by a single player, a "move" is two contiguous plays by each opponent.
%H <a href="/index/Th#TTT">Index entries for sequences related to tic-tac-toe</a>
%Y Cf. A008907.
%K fini,full,nonn
%O 0,6
%A _Rob Pratt_
%E Name clarified by _Álvar Ibeas_, Jul 27 2018