Duplicate of A007091.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =10a(5) =11a(6) =12a(7) =13a(8) =14a(9) =20a(10) =21a(11) =22a(12) =23a(13) =24a(14) =30a(15) =31a(16) =32a(17) =33a(18) =34a(19) =40a(20) =41a(21) =42a(22) =43a(23) =44a(24) =100a(25) =101a(26) =102a(27) =103a(28) =104a(29) =110