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 A317401 Number of distinct (up to rotation and reflection) tic-tac-toe positions with n tokens which allow a winning strategy for X. 2
 0, 0, 7, 9, 85, 67, 139, 70, 23, 12 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Including positions where X has already won (that is, 0 for even n, A048245(n) for odd n up to 7, and 12 for n = 9). LINKS EXAMPLE a(2) = 7: x o .   x . o   x . .   x . .   . x .   . x .   . o . . . .   . . .   . . o   . . .   o . .   . . .   . x . . . .   . . .   . . .   . . o   . . .   o . .   . . . CROSSREFS Cf. A008907, A317402, A048245. Sequence in context: A178427 A106132 A285011 * A137058 A116237 A123746 Adjacent sequences:  A317398 A317399 A317400 * A317402 A317403 A317404 KEYWORD fini,full,nonn AUTHOR Álvar Ibeas, Jul 27 2018 STATUS approved

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Last modified May 10 14:04 EDT 2021. Contains 343770 sequences. (Running on oeis4.)