A123896 sorted and duplicates removed.

Terms

a(0) =0a(1) =1a(2) =12a(3) =100a(4) =112a(5) =121a(6) =122a(7) =123a(8) =1012a(9) =1023a(10) =1102a(11) =1122a(12) =1123a(13) =1200a(14) =1201a(15) =1203a(16) =1213a(17) =1222a(18) =1223a(19) =1231a(20) =1232a(21) =1233a(22) =1234a(23) =10000a(24) =10012a(25) =10023a(26) =10102a(27) =10123a(28) =10201a(29) =10202