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| n | a(n) |
|---|---|
| 2 | 128 |
| 3 | 12758 |
| 4 | 5134240 |
| 5 | 67898771 |
| 6 | 11146309947 |
| 7 | 766834015734 |
| 8 | 4968618780985762 |
[128,12758,5134240,67898771,11146309947, 766834015734,4968618780985762] |