Positive numbers all of whose pairs of consecutive decimal digits differ by 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =12a(11) =21a(12) =23a(13) =32a(14) =34a(15) =43a(16) =45a(17) =54a(18) =56a(19) =65a(20) =67a(21) =76a(22) =78a(23) =87a(24) =89a(25) =98a(26) =101a(27) =121a(28) =123a(29) =210