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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 41 |
| 4 | 21523361 |
| 5 | 926510094425921 |
| 6 | 1716841910146256242328924544641 |
[2,5,41,21523361,926510094425921, 1716841910146256242328924544641] |