A156440 - OEIS

A156440

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 6.

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

%S 4,42,552,13751,425674,18458342,1164072896,139921844820,

%T 38221283215416,19223028387830564,13952451706754445456

%N Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 6.

%K nonn

%O 3,1

%A _R. H. Hardin_ Feb 09 2009