A023791 Katadromes: digits in base 9 are in strict descending order.

0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 18, 19, 27, 28, 29, 36, 37, 38, 39, 45, 46, 47, 48, 49, 54, 55, 56, 57, 58, 59, 63, 64, 65, 66, 67, 68, 69, 72, 73, 74, 75, 76, 77, 78, 79, 171, 252, 261, 262, 333, 342, 343, 351, 352, 353, 414, 423, 424, 432, 433, 434, 441, 442