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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 9 |
| 6 | 11 |
| 7 | 15 |
| 8 | 21 |
| 9 | 27 |
| 10 | 31 |
| 11 | 36 |
| 12 | 51 |
| 13 | 63 |
| 14 | 81 |
| 15 | 111 |
| 16 | 171 |
| 17 | 351 |
[0,1,3,6,9,11,15,21,27,31,36,51,63,81,111,171,351] |