Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 20.

A156472

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 20.

Terms

    a(0) =2a(1) =6a(2) =60a(3) =1239a(4) =112892a(5) =47944020a(6) =53004021504

External references