a(0) = 0; a(n) is obtained by incrementing each digit of a(n-1) by 1.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =10a(11) =21a(12) =32a(13) =43a(14) =54a(15) =65a(16) =76a(17) =87a(18) =98a(19) =109a(20) =2110a(21) =3221a(22) =4332a(23) =5443a(24) =6554a(25) =7665a(26) =8776a(27) =9887a(28) =10998a(29) =2110109