%I #4 Dec 18 2015 18:17:16
%S 1,0,0,4,4,0,0,1836,6871,0,0,294400160,3360660500,0,0,
%T 2033591738777760,62993444371397120,0
%N Number of n X n arrays of squares of integers, symmetric under 90 degree rotation, with all rows summing to 9.
%K nonn
%O 1,4
%A _R. H. Hardin_ Feb 09 2009