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%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
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