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%I #5 Oct 20 2014 18:33:06
%S 1,2,3,15,36,383,1505,28764,197391,6544311,74718810
%N Number of ways of placing kings with no more than 2 mutual attacks on an n X n chessboard symmetric under 180 degree rotation.
%K nonn,more,hard
%O 0,2
%A _R. H. Hardin_, Sep 04 2008