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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 5 |
| 2 | 38 |
| 3 | 2707 |
| 4 | 21418388 |
| 5 | 3000279372337641 |
| 6 | 255122481276683701099886061668842 |
[2,5,38,2707,21418388,3000279372337641, 255122481276683701099886061668842] |