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Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 18.
0

%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