A032980 Numbers n with property that all pairs of consecutive base 9 digits differ by 0 or 1.

1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 19, 20, 21, 29, 30, 31, 39, 40, 41, 49, 50, 51, 59, 60, 61, 69, 70, 71, 79, 80, 81, 82, 90, 91, 92, 100, 101, 102, 171, 172, 173, 181, 182, 183, 191, 192, 193, 262, 263, 264, 272, 273, 274, 282, 283, 284