A201626 - OEIS

%I #15 Aug 30 2016 06:25:15

%S 1,2,6,228,6745,252792,11281312,585632520,34690541994,2309813476870,

%T 170797663069044,13888215374348892,1231730727253607451,

%U 118329596584708240732,12241103359460777972760,1356712722052907806912016

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

%C Wazir is a leaper [0,1].

%H V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Non-attacking chess pieces</a>, 6ed, 2013, p. 411.

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

%Y Cf. A027683, A201511.

%K nonn,hard

%O 1,2

%A _Vaclav Kotesovec_, Dec 03 2011