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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 90 |
| 4 | 2448 |
| 5 | 105218 |
| 6 | 6572088 |
| 7 | 562874958 |
| 8 | 63344668632 |
| 9 | 9067009872984 |
| 10 | 1608913338743280 |
| 11 | 346665863545391736 |
| 12 | 89160540714537206616 |
| 13 | 26982910637581823115028 |
| 14 | 9492077262717161359915632 |
[1,6,90,2448,105218,6572088,562874958,63344668632, 9067009872984,1608913338743280,346665863545391736, 89160540714537206616,26982910637581823115028, 9492077262717161359915632] |