1,2

Number of open directed king's tours on the nxn board.

Eric Weisstein's World of Mathematics, King's Tour Graph

Cf. A140521, A096969, A137891.

Sequence in context: A105187 A062313 A062528 this_sequence A078522 A005149 A027411

Adjacent sequences: A158648 A158649 A158650 this_sequence A158652 A158653 A158654

nonn,more

E. W. Weisstein (eric(AT)weisstein.com), Mar 23, 2009

a(5) from Max Alekseyev (maxale(AT)gmail.com), May 03 2009