Second unsigned column of triangle A051380.

A051562

Second unsigned column of triangle A051380.

Terms

    a(0) =0a(1) =1a(2) =19a(3) =299a(4) =4578a(5) =71394a(6) =1153956a(7) =19471500a(8) =343976400a(9) =6366517200a(10) =123418922400

External references