Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 9.

A156448

Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 9.

Terms

    a(0) =1a(1) =2a(2) =8a(3) =68a(4) =868a(5) =19436a(6) =638012a(7) =57507580a(8) =22620401127

External references