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A195624
Minimum number of squares removed from an n-dimensional tic-tac-toe board to make winning impossible for either player.
0
3, 9, 29, 93, 279
OFFSET
2,1
COMMENTS
A156989 is the main sequence for this entry. Related to the density Hales-Jewett theorem.
FORMULA
a(n) = 3^n - A156989(n).
CROSSREFS
Cf. A156989.
Sequence in context: A262253 A303546 A135142 * A098589 A024744 A024964
KEYWORD
nonn,hard
AUTHOR
STATUS
approved