Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 21.

A156475

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 21.

Terms

    a(0) =6a(1) =130a(2) =1872a(3) =121382a(4) =17647254a(5) =18669753424

External references