A043324 Numbers n such that number of 0's in base 3 is 4.

81, 162, 244, 245, 246, 249, 252, 261, 270, 297, 324, 405, 487, 488, 489, 492, 495, 504, 513, 540, 567, 648, 733, 734, 736, 737, 739, 740, 741, 744, 748, 749, 750, 753, 757, 758, 759, 762, 765, 774, 784, 785, 786, 789, 792, 801