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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 1097 |
| 3 | 23675 |
| 4 | 1287919 |
| 5 | 128004881 |
| 6 | 32223974061 |
| 7 | 13954220420440 |
| 8 | 15244019769376849 |
| 9 | 29037002912540214181 |
[81,1097,23675,1287919,128004881,32223974061, 13954220420440,15244019769376849, 29037002912540214181] |