1,2

a(n) ~ (n!)^2 / 2^n.

D. Bevan, Winning Positions and Optimal Play in the Game of Hex, forthcoming.

a(3) = 11; 8 of length 3 (cf. A001792) plus 2 of length 4 (cf. A096367) plus 1 of length 5 [a1,a2,b2,c2,c3].

Cf. A001792, A096367.

Sequence in context: A057325 A054700 A009280 this_sequence A094259 A091845 A020061

Adjacent sequences: A095704 A095705 A095706 this_sequence A095708 A095709 A095710

nonn

David Bevan (dbevan(AT)emtex.com), Jul 07 2004