Number of 18 X 18 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.
A156426
Number of 18 X 18 arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to n.
Terms
- a(0) =1a(1) =168992a(2) =2037627900
External references
- oeis: A156426