Each digit of a(n) appears in a(n+1) and a(n+1) > a(n) is minimal.

Terms

a(0) =0a(1) =10a(2) =100a(3) =101a(4) =102a(5) =120a(6) =201a(7) =210a(8) =1002a(9) =1012a(10) =1020a(11) =1021a(12) =1022a(13) =1023a(14) =1032a(15) =1203a(16) =1230a(17) =1302a(18) =1320a(19) =2013a(20) =2031a(21) =2103a(22) =2130a(23) =2301a(24) =2310a(25) =3012a(26) =3021a(27) =3102a(28) =3120a(29) =3201