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| n | a(n) |
|---|---|
| 2 | 5 |
| 3 | 81 |
| 4 | 1221 |
| 5 | 20217 |
| 6 | 321681 |
| 7 | 5160709 |
| 8 | 82572997 |
| 9 | 1321255761 |
| 10 | 21139851257 |
[5,81,1221,20217,321681,5160709,82572997, 1321255761,21139851257] |