a(n) = 10*11^n-1.

Terms

a(0) =9a(1) =109a(2) =1209a(3) =13309a(4) =146409a(5) =1610509a(6) =17715609a(7) =194871709a(8) =2143588809a(9) =23579476909a(10) =259374246009