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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 4 |
| 5 | 6 |
| 6 | 7 |
| 7 | 9 |
| 8 | 10 |
| 9 | 15 |
| 10 | 19 |
| 11 | 22 |
| 12 | 30 |
| 13 | 37 |
| 14 | 42 |
| 15 | 57 |
| 16 | 70 |
| 17 | 79 |
| 18 | 187 |
| 19 | 190 |
| 20 | 274 |
| 21 | 715 |
| 22 | 1317 |
[1,2,3,4,6,7,9,10,15,19,22,30,37,42,57,70,79,187, 190,274,715,1317] |