Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 18.

A156469

Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 18.

Terms

    a(0) =1a(1) =4a(2) =54a(3) =112a(4) =5414a(5) =21624a(6) =2133044a(7) =23029656a(8) =5468265896a(9) =163052061000

External references