Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 12.

A156455

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 12.

Terms

    a(0) =1a(1) =20a(2) =352a(3) =17550a(4) =2246390a(5) =991288522a(6) =781505368112

External references