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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 6 |
| 3 | 21 |
| 4 | 231 |
| 5 | 26796 |
| 6 | 359026206 |
| 7 | 64449908476890321 |
| 8 | 2076895351339769460477611370186681 |
| 9 | 2156747150208372213435450937462082366919951682912789656986079991221 |
[2,3,6,21,231,26796,359026206,64449908476890321, 2076895351339769460477611370186681, 21567471502083722134354509374620823669199516829127\ 89656986079991221] |