Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 20.

A156473

Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 20.

Terms

    a(0) =2a(1) =0a(2) =32a(3) =75a(4) =3154a(5) =31638a(6) =4561976a(7) =75335814a(8) =23873894500a(9) =748560286220

External references