%I #5 Oct 20 2014 18:36:19
%S 1,2,3,9,16,61,143,802,2265,17236,59156,631443,2686969,39237301,
%T 210001256
%N Number of ways of placing kings with no more than 4 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