Positive numbers with the property that all pairs of consecutive base-10 digits differ by 0 or 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =6a(6) =7a(7) =8a(8) =9a(9) =10a(10) =11a(11) =12a(12) =21a(13) =22a(14) =23a(15) =32a(16) =33a(17) =34a(18) =43a(19) =44a(20) =45a(21) =54a(22) =55a(23) =56a(24) =65a(25) =66a(26) =67a(27) =76a(28) =77a(29) =78