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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 205920 |
| 3 | 2323234636800 |
| 4 | 7506428481300850827264 |
| 5 | 6612015156138094974390271820169216 |
[6,205920,2323234636800,7506428481300850827264, 6612015156138094974390271820169216] |