A201626 Number of ways to place n nonattacking wazirs on an n X n toroidal board.

1, 2, 6, 228, 6745, 252792, 11281312, 585632520, 34690541994, 2309813476870, 170797663069044, 13888215374348892, 1231730727253607451, 118329596584708240732, 12241103359460777972760, 1356712722052907806912016

Offset: 1

Author

Vaclav Kotesovec, Dec 03 2011

Keywords

• nonn
• hard

Comments

Wazir is a leaper [0,1].

Links

• V. Kotesovec, Non-attacking chess pieces, 6ed, 2013, p. 411.

Crossrefs

Cf. A027683, A201511.

Formula

Asymptotics: a(n) ~ n^(2n)/n!*exp(-5/2).