Numbers with the property that all pairs of consecutive base-9 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) =11a(10) =19a(11) =21a(12) =29a(13) =31a(14) =39a(15) =41a(16) =49a(17) =51a(18) =59a(19) =61a(20) =69a(21) =71a(22) =79a(23) =82a(24) =100a(25) =102a(26) =171a(27) =173a(28) =191a(29) =193