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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 2135 |
| 4 | 29281354514767167 |
| 5 | 1994324729203114587259985605157804740271034553359179870979936357974015 |
[1,2,10,2135,29281354514767167, 19943247292031145872599856051578047402710345533591\ 79870979936357974015] |