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| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 1785 |
| 3 | 58251 |
| 4 | 2271055 |
| 5 | 91004329 |
| 6 | 3553672817 |
| 7 | 139547279602 |
| 8 | 5483284264255 |
| 9 | 215325152512080 |
| 10 | 8456644209542369 |
| 11 | 332127680070833366 |
| 12 | 13043925893565344468 |
| 13 | 512285988066386259951 |
| 14 | 20119470378862894580835 |
[21,1785,58251,2271055,91004329,3553672817, 139547279602,5483284264255,215325152512080, 8456644209542369,332127680070833366, 13043925893565344468,512285988066386259951, 20119470378862894580835] |