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%I #5 Oct 20 2014 18:30:23
%S 1,2,5,15,62,329,2307,21482,264021,4334045,94435970,2750500857,
%T 106769182533
%N Number of ways of placing kings with no more than 1 mutual attack 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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