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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 89 |
| 3 | 7921 |
| 4 | 178000 |
| 5 | 4000000 |
| 6 | 160564000 |
| 7 | 6445199524 |
| 8 | 219637743496 |
| 9 | 7484754845584 |
| 10 | 273712171834464 |
| 11 | 10009459836154944 |
| 12 | 358827105960491520 |
| 13 | 12863520517551001600 |
| 14 | 465176569014432986560 |
| 15 | 16821929895847549418521 |
[1,89,7921,178000,4000000,160564000,6445199524, 219637743496,7484754845584,273712171834464, 10009459836154944,358827105960491520, 12863520517551001600,465176569014432986560, 16821929895847549418521] |