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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 4181 |
| 3 | 24157817 |
| 4 | 83621143489848422977 |
| 5 | 322615043836854783580186309282650000354271239929 |
[1,2,4181,24157817,83621143489848422977, 322615043836854783580186309282650000354271239929] |