Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45.

A156509

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 45.

Terms

    a(0) =2a(1) =12a(2) =390a(3) =12963a(4) =1881506a(5) =1336889688

External references