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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 main diagonal.
2

%I #5 Oct 20 2014 18:35:54

%S 1,2,7,33,202,1671,17279,234724,4081665,92343898,2711730350,

%T 103991393887,5218390436191

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

%K nonn,more,hard

%O 0,2

%A _R. H. Hardin_, Sep 04 2008