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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 9 |
| 5 | 13 |
| 6 | 17 |
| 7 | 22 |
| 8 | 28 |
| 9 | 35 |
| 10 | 41 |
| 11 | 49 |
| 12 | 57 |
| 13 | 65 |
| 14 | 73 |
| 15 | 82 |
| 16 | 93 |
| 17 | 103 |
| 18 | 113 |
| 19 | 125 |
| 20 | 137 |
[1,3,6,9,13,17,22,28,35,41,49,57,65,73,82,93,103, 113,125,137] |