Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 81.

A156525

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 81.

Terms

    a(0) =1a(1) =2a(2) =24a(3) =552a(4) =39012a(5) =11870808a(6) =25684597626

External references