Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 27.

A156487

Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 27.

Terms

    a(0) =3a(1) =58a(2) =204a(3) =13400a(4) =102762a(5) =19311868a(6) =365142544a(7) =166203280736

External references