The OEIS is supported by the many generous donors to the OEIS Foundation.
%I #6 Oct 02 2025 22:14:08
%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