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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 76 |
| 3 | 439204 |
| 4 | 84722519070079276 |
| 5 | 608130213374088941214747405817720942127490792974404 |
[1,4,76,439204,84722519070079276, 60813021337408894121474740581772094212749079297440\ 4] |