A156415 - OEIS

A156415

Number of 13 X 13 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.

%I #5 Oct 27 2019 21:42:52

%S 1,120,0,0,14564760,66083040,0,0,2511725250,3360660500,0,0,

%T 105602337600,192407274081,0,0,1556654915420,1665635124840,0,0

%N Number of 13 X 13 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.

%K nonn

%O 0,2

%A _R. H. Hardin_, Feb 09 2009