%I #5 Oct 20 2014 18:34:00
%S 1,2,7,29,160,1135,10529,125770,1963039,39868375,1061669314,
%T 37110747097,1708827058427
%N Number of ways of placing kings with no more than 3 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