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| n | a(n) |
|---|---|
| 2 | 288 |
| 3 | 28200960 |
| 4 | 29136487207403520 |
| 5 | 1903816047972624930994913280000 |
[288,28200960,29136487207403520, 1903816047972624930994913280000] |