%I #4 Dec 18 2015 18:17:16
%S 1,4,54,112,5414,21624,2133044,23029656,5468265896,163052061000,
%T 97305384072800
%N Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 18.
%K nonn
%O 2,2
%A _R. H. Hardin_ Feb 09 2009