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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 4 | 11 |
| 5 | 34 |
| 6 | 2136 |
| 7 | 7013320 |
| 8 | 29281354514767168 |
| 9 | 234431745534048922731115555415680 |
| 10 | 1994324729203114587259985605157804740271034553359179870979936357974016 |
[2,2,3,4,11,34,2136,7013320,29281354514767168, 234431745534048922731115555415680, 19943247292031145872599856051578047402710345533591\ 79870979936357974016] |