A156458 - OEIS

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A156458

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13.

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

%S 2,6,68,876,43300,3026820,558858552,474109634808,1011861877473980,

%T 3520221010293816000

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13.

%K nonn

%O 2,1

%A _R. H. Hardin_ Feb 09 2009