a(n) = 10*n + 9.

Terms

a(0) =9a(1) =19a(2) =29a(3) =39a(4) =49a(5) =59a(6) =69a(7) =79a(8) =89a(9) =99a(10) =109a(11) =119a(12) =129a(13) =139a(14) =149a(15) =159a(16) =169a(17) =179a(18) =189a(19) =199a(20) =209a(21) =219a(22) =229a(23) =239a(24) =249a(25) =259a(26) =269a(27) =279a(28) =289a(29) =299