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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 34012224 |
| 4 | 8303765625 |
| 5 | 24794911296 |
| 6 | 68719476736 |
[0,1,34012224,8303765625,24794911296,68719476736] |