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Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.
2

%I #5 Oct 20 2014 18:36:19

%S 1,2,3,9,16,61,143,802,2265,17236,59156,631443,2686969,39237301,

%T 210001256

%N Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric about both diagonal and antidiagonal.

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008