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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 231 |
| 3 | 1253329 |
| 4 | 164185416899 |
| 5 | 523957519578572209 |
| 6 | 40918963843906494595507077 |
[1,231,1253329,164185416899,523957519578572209, 40918963843906494595507077] |