a(n) = 11*n + 9.

Terms

a(0) =9a(1) =20a(2) =31a(3) =42a(4) =53a(5) =64a(6) =75a(7) =86a(8) =97a(9) =108a(10) =119a(11) =130a(12) =141a(13) =152a(14) =163a(15) =174a(16) =185a(17) =196a(18) =207a(19) =218a(20) =229a(21) =240a(22) =251a(23) =262a(24) =273a(25) =284a(26) =295a(27) =306a(28) =317a(29) =328