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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 109 |
| 4 | 11087 |
| 5 | 15312665 |
| 6 | 422059040480 |
| 7 | 312210595377427422 |
| 8 | 7962423724145466121172404 |
| 9 | 8668986293188852191645897272339367 |
[1,2,8,109,11087,15312665,422059040480, 312210595377427422,7962423724145466121172404, 8668986293188852191645897272339367] |