Palindromes whose digits do not appear in previous term.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =11a(11) =22a(12) =33a(13) =44a(14) =55a(15) =66a(16) =77a(17) =88a(18) =99a(19) =101a(20) =222a(21) =303a(22) =414a(23) =505a(24) =616a(25) =707a(26) =818a(27) =909a(28) =1111a(29) =2002