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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 61731 |
| 3 | 220157391087140625 |
| 4 | 3109768877542258728107559478225309328087616 |
[1,3,61731,220157391087140625, 3109768877542258728107559478225309328087616] |