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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 129600 |
| 4 | 17210368000000 |
| 5 | 14344087024170010017792000 |
| 6 | 108802808353712082212104996827371705204736 |
| 7 | 10395932534012968042533315321842530487986106853298174278238208 |
[1,4,129600,17210368000000, 14344087024170010017792000, 108802808353712082212104996827371705204736, 10395932534012968042533315321842530487986106853298\ 174278238208] |