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Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric under horizontal reflection.
2

%I #5 Oct 20 2014 18:35:10

%S 1,2,3,35,60,2459,2907,447758,410457,237456332,154828648,342431110933,

%T 169227858597,1508376191950535,537887672115734

%N Number of ways of placing kings with no more than 4 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