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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 647 |
| 4 | 32547 |
| 5 | 32104903 |
| 6 | 5850859031888599 |
| 7 | 29453515169174062608487 |
| 8 | 2335404534493957255219087217249 |
| 9 | 418207321191051873285940121750107840759 |
[1,7,647,32547,32104903,5850859031888599, 29453515169174062608487, 2335404534493957255219087217249, 418207321191051873285940121750107840759] |