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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 94944 |
| 3 | 75950349984 |
| 4 | 491266279475336448 |
| 5 | 14878750986930581844249600 |
[3,94944,75950349984,491266279475336448, 14878750986930581844249600] |