a(n) = 9^n + 1.

Terms

a(0) =2a(1) =10a(2) =82a(3) =730a(4) =6562a(5) =59050a(6) =531442a(7) =4782970a(8) =43046722a(9) =387420490a(10) =3486784402a(11) =31381059610a(12) =282429536482