a(n) = 10^n - 9^n.

Terms

a(0) =0a(1) =1a(2) =19a(3) =271a(4) =3439a(5) =40951a(6) =468559a(7) =5217031a(8) =56953279a(9) =612579511a(10) =6513215599a(11) =68618940391a(12) =717570463519