As in chess, a "play" is an action by a single player, a "move" is two contiguous plays by each opponent.
Table of n, a(n) for n=0..9.
Index entries for sequences related to tic-tac-toe
Sequence in context: A151910 A040421 A022355 * A246034 A220689 A056485
Adjacent sequences: A048242 A048243 A048244 * A048246 A048247 A048248
Name clarified by Álvar Ibeas, Jul 27 2018