As in chess, a "play" is an action by a single player, a "move" is two contiguous plays (one by each opponent).
Table of n, a(n) for n=1..9.
H. Bottomley, Details
Index entries for sequences related to tic-tac-toe
Sequence in context: A179691 A078095 A157508 * A238041 A187291 A187193
Adjacent sequences: A061218 A061219 A061220 * A061222 A061223 A061224
Henry Bottomley, May 31 2001