Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13.
A156458
Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 13.
Terms
- a(0) =2a(1) =6a(2) =68a(3) =876a(4) =43300a(5) =3026820a(6) =558858552a(7) =474109634808
External references
- oeis: A156458