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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 49.
0

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

%S 1,2,2,82,210,24604,157700,153363108,4197081428,19984585910224

%N Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 49.

%K nonn

%O 1,2

%A _R. H. Hardin_ Feb 09 2009