Write what is described (putting a leading zero on numbers which have an odd number of digits).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =0a(9) =0a(10) =0a(11) =1a(12) =2a(13) =3a(14) =4a(15) =5a(16) =6a(17) =7a(18) =8a(19) =9a(20) =0a(21) =11a(22) =22a(23) =33a(24) =44a(25) =55a(26) =66a(27) =77a(28) =88a(29) =99