A156518 - OEIS

A156518

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 61.

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

%S 2,12,326,16298,5919644,9055603332,108964188487952,6758216414353306068

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 61.

%K nonn

%O 2,1

%A _R. H. Hardin_ Feb 09 2009