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%I #7 Nov 25 2018 12:29:53
%S 1,2,1,5,2,15,7,68,23,370,104,2649,571,25209,4176,313503,39827,
%T 5212881,500254,114569731,8348616
%N Number of ways of placing kings with no more than 4 mutual attacks on an n X n chessboard symmetric about the diagonal and under 90-degree rotation.
%K nonn,more,hard
%O 0,2
%A _R. H. Hardin_, Sep 04 2008
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