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Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric under horizontal reflection.
1

%I #5 Oct 20 2014 18:33:44

%S 1,2,3,29,48,1401,1825,183270,194391,76221979,59133738,86201358557,

%T 54181631319,318503225414986,146475713866791

%N Number of ways of placing kings with no more than 3 mutual attacks on an n X n chessboard symmetric under horizontal reflection.

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008