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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 112 |
| 3 | 403200 |
| 4 | 1755760043520000 |
| 5 | 53695136666462381094317154204367872000000 |
[7,112,403200,1755760043520000, 53695136666462381094317154204367872000000] |