A087068 Sum{Floor(n*(r^k): r=2/3, k>=0).

0, 1, 3, 6, 8, 11, 14, 17, 20, 23, 24, 28, 32, 33, 37, 39, 43, 46, 50, 51, 53, 58, 59, 64, 67, 69, 73, 77, 78, 80, 83, 87, 90, 92, 95, 99, 103, 104, 108, 112, 113, 118, 120, 122, 125, 128, 132, 134, 138, 139, 142, 146, 150, 152, 157, 158, 161, 165, 168, 171, 173, 178