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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 81 |
| 3 | 528710 |
| 4 | 3078729612504 |
| 5 | 39365894794886211936384 |
| 6 | 2615263044919921664782892915256720000 |
| 7 | 1836670053921243130054784143187780915636829250560000000 |
[2,2,81,528710,3078729612504, 39365894794886211936384, 2615263044919921664782892915256720000, 18366700539212431300547841431877809156368292505600\ 00000] |