Number of 15 X 15 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.
A156420
Number of 15 X 15 arrays of squares of integers, symmetric under 90-degree rotation, with all rows summing to n.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =30693320a(4) =1890254100a(5) =0a(6) =0a(7) =686163316440a(9) =0a(10) =0a(13) =0a(14) =0
External references
- oeis: A156420