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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 24 |
| 3 | 1861 |
| 4 | 168661 |
| 5 | 16902651 |
| 6 | 1797062518 |
| 7 | 199090941069 |
[1,24,1861,168661,16902651,1797062518, 199090941069] |