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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 9 |
| 4 | 730 |
| 5 | 389017001 |
| 6 | 58871587162270593034051002 |
| 7 | 204040901322752673844230437877671861543858084850895762746141813554591014612009 |
[0,1,2,9,730,389017001,58871587162270593034051002, 20404090132275267384423043787767186154385808485089\ 5762746141813554591014612009] |