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%I
%S 0,0,9,68,215,504,1001,1784,2943,4580,6809,9756,13559,18368,24345,
%T 31664,40511,51084,63593,78260,95319,115016,137609,163368,192575,
%U 225524,262521,303884,349943,401040,457529,519776,588159,663068,744905,834084,931031,1036184
%N Number of ways to place 2 nonattacking kings on an n X n cylindrical chessboard.
%H V. Kotesovec, <a href="https://oeis.org/wiki/User:Vaclav_Kotesovec">Number of ways of placing non-attacking queens, kings, bishops and knights</a>
%F a(n) = 1/2*n*(n^3 - 9*n + 6), n>=3.
%F G.f.: x^3*(4*x^4 - 19*x^3 + 35*x^2 - 23*x - 9)/(x-1)^5.
%Y Cf. A061995, A179403.
%K nonn
%O 1,3
%A _Vaclav Kotesovec_, Aug 31 2011
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