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%I #12 May 02 2019 08:21:01
%S 0,0,0,8,5,72,38,56,23,0
%N Number of distinct (up to rotation and reflection) tic-tac-toe positions with n tokens which allow a winning strategy for O.
%C Including positions where O has already won (that is, 0 for odd n and A048245(n) for even n).
%H <a href="/index/Th#TTT">Index entries for sequences related to tic-tac-toe</a>
%e a(4) = 5:
%e x x o x x o o x . o x . . x .
%e . . o . . . . . x . o . o o .
%e . . . . . o o . . . x . . x .
%Y Cf. A008907, A317401, A048245.
%K fini,full,nonn
%O 0,4
%A _Álvar Ibeas_, Jul 27 2018
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