G.f.: Sum_{n>=0} (2*n + 1) * x^n * (9 - x^n)^n.

A326605

G.f.: Sum_{n>=0} (2*n + 1) * x^n * (9 - x^n)^n.

Terms

    a(0) =1a(1) =27a(2) =402a(3) =5103a(4) =58959a(5) =649539a(6) =6907037a(7) =71744535a(8) =731768013a(9) =7360989480a(10) =73222111566a(11) =721764371007

External references