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| n | a(n) |
|---|---|
| 3 | 5 |
| 4 | 23 |
| 5 | 59 |
| 6 | 719 |
| 7 | 5039 |
| 8 | 6719 |
| 9 | 181439 |
| 10 | 5039 |
| 11 | 6652799 |
| 12 | 479001599 |
| 13 | 154439 |
| 14 | 87178291199 |
| 15 | 54486431999 |
| 16 | 3487131647999 |
| 17 | 59281238015999 |
| 18 | 1067062284287999 |
| 19 | 1013709170073599 |
| 20 | 405483668029439999 |
| 21 | 39070079 |
| 22 | 180503769599 |
[5,23,59,719,5039,6719,181439,5039,6652799, 479001599,154439,87178291199,54486431999, 3487131647999,59281238015999,1067062284287999, 1013709170073599,405483668029439999,39070079, 180503769599] |