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Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 19.
0

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

%S 4,68,1844,313880,91441740,58741831848,78227960348272,

%T 210460779796568160

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 19.

%K nonn

%O 3,1

%A _R. H. Hardin_ Feb 09 2009