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%I #5 Oct 20 2014 18:30:44
%S 1,2,3,5,8,21,53,158,503,2181,9658,53517,313683,2389270
%N Number of ways of placing kings with no more than 1 mutual attack on an n X n chessboard symmetric about both diagonal and antidiagonal.
%K nonn,more,hard
%O 0,2
%A _R. H. Hardin_, Sep 04 2008
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