A098766 Lexicographically smallest increasing sequence with property that in the concatenation of its terms every pair of consecutive digits differs by 1.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 87, 89, 876, 5432, 10101, 21010, 101010, 101012, 101210, 101212, 101232, 101234, 321010, 1010101, 2101010, 10101010, 10101012, 10101210, 10101212, 10101232, 10101234, 32101010, 101010101, 210101010, 1010101010, 1010101012, 1010101210