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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 8 |
| 4 | 13824 |
| 5 | 71328803586048 |
| 6 | 9798477119793909670551703700100284084649984 |
[1,1,8,13824,71328803586048, 9798477119793909670551703700100284084649984] |