a(n) = 9^n + n.

Terms

a(0) =1a(1) =10a(2) =83a(3) =732a(4) =6565a(5) =59054a(6) =531447a(7) =4782976a(8) =43046729a(9) =387420498a(10) =3486784411a(11) =31381059620a(12) =282429536493