A156455 - OEIS

A156455

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 12.

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

%S 1,20,352,17550,2246390,991288522,781505368112,976681206480324,

%T 1865446774685049420

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 12.

%K nonn

%O 3,2

%A _R. H. Hardin_ Feb 09 2009