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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 17 |
| 2 | 291 |
| 3 | 84684 |
| 4 | 7171379860 |
| 5 | 51428689096413619605 |
| 6 | 2644910062175573125355281735337640356031 |
| 7 | 6995549236997594095768769895625713364190838574177475661857423797590740438072968 |
[4,17,291,84684,7171379860,51428689096413619605, 2644910062175573125355281735337640356031, 69955492369975940957687698956257133641908385741774\ 75661857423797590740438072968] |