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A143877 Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under horizontal and vertical reflection. 1

%I

%S 1,2,1,7,4,55,17,576,129,13243,1554,465675,35443,32233206,1330673,

%T 3746034675,92945020

%N Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under horizontal and vertical reflection.

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008

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Last modified January 28 21:21 EST 2022. Contains 350668 sequences. (Running on oeis4.)