Number of 20 X 20 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.
A156428
Number of 20 X 20 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.
Terms
- a(0) =1a(1) =921184a(2) =52745205240
External references
- oeis: A156428