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A317402 Number of distinct (up to rotation and reflection) tic-tac-toe positions with n tokens which allow a winning strategy for O. 2
0, 0, 0, 8, 5, 72, 38, 56, 23, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Including positions where O has already won (that is, 0 for odd n and A048245(n) for even n).

LINKS

Table of n, a(n) for n=0..9.

Index entries for sequences related to tic-tac-toe

EXAMPLE

a(4) = 5:

x x o   x x o   o x .   o x .   . x .

. . o   . . .   . . x   . o .   o o .

. . .   . . o   o . .   . x .   . x .

CROSSREFS

Cf. A008907, A317401, A048245.

Sequence in context: A272007 A296437 A038283 * A317574 A195532 A106287

Adjacent sequences:  A317399 A317400 A317401 * A317403 A317404 A317405

KEYWORD

fini,full,nonn

AUTHOR

Álvar Ibeas, Jul 27 2018

STATUS

approved

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Last modified May 16 15:55 EDT 2021. Contains 343949 sequences. (Running on oeis4.)