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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 31 |
| 4 | 283 |
| 5 | 3381 |
| 6 | 49781 |
| 7 | 870199 |
| 8 | 17600759 |
| 9 | 404197705 |
| 10 | 10387420489 |
[2,5,31,283,3381,49781,870199,17600759,404197705, 10387420489] |