A043477 Numbers n such that number of 6's in base 9 is 1.

6, 15, 24, 33, 42, 51, 54, 55, 56, 57, 58, 59, 61, 62, 69, 78, 87, 96, 105, 114, 123, 132, 135, 136, 137, 138, 139, 140, 142, 143, 150, 159, 168, 177, 186, 195, 204, 213, 216, 217, 218, 219, 220, 221, 223, 224, 231, 240, 249, 258