a(n) = 10*n + 1.

Terms

a(0) =1a(1) =11a(2) =21a(3) =31a(4) =41a(5) =51a(6) =61a(7) =71a(8) =81a(9) =91a(10) =101a(11) =111a(12) =121a(13) =131a(14) =141a(15) =151a(16) =161a(17) =171a(18) =181a(19) =191a(20) =201a(21) =211a(22) =221a(23) =231a(24) =241a(25) =251a(26) =261a(27) =271a(28) =281a(29) =291