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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 894 |
| 9 | 18202 |
| 10 | 342356 |
| 11 | 6214281 |
| 12 | 111474723 |
| 13 | 2004234854 |
| 14 | 36440475644 |
| 15 | 674063084277 |
[1,37,894,18202,342356,6214281,111474723, 2004234854,36440475644,674063084277] |