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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 21 |
| 5 | 36 |
| 6 | 66 |
| 7 | 91 |
| 8 | 136 |
| 9 | 406 |
| 10 | 666 |
| 11 | 703 |
| 12 | 903 |
| 13 | 3003 |
| 14 | 6903 |
| 15 | 7021 |
| 16 | 8001 |
| 17 | 5000703 |
[1,3,6,21,36,66,91,136,406,666,703,903,3003,6903, 7021,8001,5000703] |