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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 56 |
| 3 | 7792 |
| 4 | 2708848 |
| 5 | 2359936032 |
| 6 | 5165337368432 |
| 7 | 28435992292698928 |
[1,56,7792,2708848,2359936032,5165337368432, 28435992292698928] |