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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 243 |
| 4 | 69282 |
| 5 | 36600664305 |
| 6 | 6435072487994269232829 |
| 7 | 364103502021384610224777078613738432189483892 |
[1,2,15,243,69282,36600664305, 6435072487994269232829, 364103502021384610224777078613738432189483892] |