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| n | a(n) |
|---|---|
| 3 | 4 |
| 4 | 37 |
| 5 | 1489 |
| 6 | 2059 |
| 7 | 128431 |
| 8 | 621139 |
| 9 | 6527971 |
| 10 | 7435423 |
| 11 | 1005856303 |
| 12 | 1108515013 |
| 13 | 204122194357 |
| 14 | 220369102177 |
| 15 | 236110035385 |
| 16 | 1005497693095 |
| 17 | 307715924645815 |
| 18 | 324354836175055 |
| 19 | 122932720987212535 |
| 20 | 128616795798807715 |
| 21 | 134153085587608915 |
| 22 | 139549693559545915 |
[4,37,1489,2059,128431,621139,6527971,7435423, 1005856303,1108515013,204122194357,220369102177, 236110035385,1005497693095,307715924645815, 324354836175055,122932720987212535, 128616795798807715,134153085587608915, 139549693559545915] |