a(1)=1, a(n) = 20*a(n-1) + n.

A014904

a(1)=1, a(n) = 20*a(n-1) + n.

Terms

    a(0) =1a(1) =22a(2) =443a(3) =8864a(4) =177285a(5) =3545706a(6) =70914127a(7) =1418282548a(8) =28365650969a(9) =567313019390

External references