A048315 Numbers whose base-4 expansions, read from left to right, have run lengths that strictly decrease.
0, 1, 2, 3, 5, 10, 15, 20, 21, 22, 23, 40, 41, 42, 43, 60, 61, 62, 63, 84, 85, 86, 87, 168, 169, 170, 171, 252, 253, 254, 255, 336, 340, 341, 342, 343, 346, 351, 672, 677, 680, 681, 682, 683, 687, 1008, 1013, 1018, 1020, 1021, 1022, 1023, 1345, 1346, 1347
Offset: 0