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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 12.
0

%I #4 Dec 18 2015 18:17:16

%S 1,12,12,926,3066,417378,4260776,624439948,10607876660,2165316809841,

%T 59576593947316,18657442342135966

%N Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 12.

%K nonn

%O 3,2

%A _R. H. Hardin_ Feb 09 2009