A043456 Numbers n such that number of 0's in base 9 is 4.

6561, 13122, 19683, 26244, 32805, 39366, 45927, 52488, 59050, 59051, 59052, 59053, 59054, 59055, 59056, 59057, 59058, 59067, 59076, 59085, 59094, 59103, 59112, 59121, 59130, 59211, 59292, 59373, 59454, 59535, 59616