A043707 Numbers whose base-4 representation has an odd number of runs.
1, 2, 3, 5, 10, 15, 17, 18, 19, 21, 24, 25, 27, 28, 29, 30, 33, 34, 35, 36, 38, 39, 42, 44, 45, 46, 49, 50, 51, 52, 54, 55, 56, 57, 59, 63, 65, 66, 67, 69, 74, 79, 81, 82, 83, 85, 88, 89, 91, 92, 93, 94, 96, 101, 104, 105, 107, 111, 112, 117
Offset: 1