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A194650 Number of ways to place 2 nonattacking kings on an n X n cylindrical chessboard. 5

%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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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)