A044064 Numbers n such that string 0,3 occurs in the base 4 representation of n but not of n-1.

19, 35, 51, 67, 76, 83, 99, 115, 131, 140, 147, 163, 179, 195, 204, 211, 227, 243, 259, 268, 275, 291, 304, 323, 332, 339, 355, 371, 387, 396, 403, 419, 435, 451, 460, 467, 483, 499, 515, 524, 531, 547, 560, 579, 588, 595, 611