Numbers with the property that all pairs of consecutive base-3 digits differ by 0 or 1.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =5a(5) =7a(6) =8a(7) =9a(8) =10a(9) =12a(10) =13a(11) =14a(12) =16a(13) =17a(14) =21a(15) =22a(16) =23a(17) =25a(18) =26a(19) =27a(20) =28a(21) =30a(22) =31a(23) =32a(24) =36a(25) =37a(26) =39a(27) =40a(28) =41a(29) =43