A118763 a(n) = smallest number not occurring earlier having in decimal representation to its predecessor Levenshtein distance = 1; a(0)=0.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 19, 10, 11, 12, 13, 14, 15, 16, 17, 18, 28, 20, 21, 22, 23, 24, 25, 26, 27, 29, 39, 30, 31, 32, 33, 34, 35, 36, 37, 38, 48, 40, 41, 42, 43, 44, 45, 46, 47, 49, 59, 50, 51, 52, 53, 54, 55, 56, 57, 58, 68, 60, 61, 62, 63, 64, 65, 66, 67, 69, 79, 70, 71