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

A156468

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

Terms

    a(0) =1a(1) =8a(2) =114a(3) =3704a(4) =285470a(5) =46859304a(6) =17604991124

External references