A057520 a(n) = A014486[n]/2. In binary expansion there is one more 1 than 0 and reading from the left (the most significant bit) to right, the number of 0's never exceed the number of 1's.

0, 1, 5, 6, 21, 22, 25, 26, 28, 85, 86, 89, 90, 92, 101, 102, 105, 106, 108, 113, 114, 116, 120, 341, 342, 345, 346, 348, 357, 358, 361, 362, 364, 369, 370, 372, 376, 405, 406, 409, 410, 412, 421, 422, 425, 426, 428, 433, 434, 436, 440, 453, 454, 457, 458, 460