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| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 168 |
| 3 | 42168 |
| 4 | 46008720 |
| 5 | 757664837832 |
| 6 | 53263771547091072 |
| 7 | 56395315109321439563328 |
| 8 | 254765586321230138822186989968 |
| 9 | 17333186258617759005034608109179216168 |
[9,168,42168,46008720,757664837832, 53263771547091072,56395315109321439563328, 254765586321230138822186989968, 17333186258617759005034608109179216168] |