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).

EXAMPLE

a(2) = 7:

x o . x . o x . . x . . . x . . x . . o .

. . . . . . . . o . . . o . . . . . . x .

. . . . . . . . . . . o . . . o . . . . .

CROSSREFS

KEYWORD

fini,full,nonn

AUTHOR

Álvar Ibeas, Jul 27 2018

STATUS

approved