%I #5 Oct 20 2014 18:34:20
%S 1,2,3,7,16,41,121,434,1581,7325,35854,219307,1397579,11370922
%N Number of ways of placing kings with no more than 3 mutual attacks 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