Take list of odd numbers, move left digit of each term to end of previous term.

Terms

a(0) =1a(1) =3a(2) =5a(3) =7a(4) =9a(5) =1a(6) =11a(7) =31a(8) =51a(9) =71a(10) =92a(11) =12a(12) =32a(13) =52a(14) =72a(15) =93a(16) =13a(17) =33a(18) =53a(19) =73a(20) =94a(21) =14a(22) =34a(23) =54a(24) =74a(25) =95a(26) =15a(27) =35a(28) =55a(29) =75