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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 9 |
| 6 | 10 |
| 7 | 13 |
| 8 | 16 |
| 9 | 19 |
| 10 | 22 |
| 11 | 25 |
| 12 | 27 |
| 13 | 28 |
| 14 | 31 |
| 15 | 34 |
| 16 | 36 |
| 17 | 37 |
| 18 | 40 |
| 19 | 43 |
| 20 | 46 |
| 21 | 49 |
| 22 | 52 |
[0,1,4,7,9,10,13,16,19,22,25,27,28,31,34,36,37,40, 43,46,49,52] |