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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 17 |
| 3 | 1297 |
| 4 | 331777 |
| 5 | 207360001 |
| 6 | 268738560001 |
| 7 | 645241282560001 |
| 8 | 2642908293365760001 |
| 9 | 17340121312772751360001 |
| 10 | 173401213127727513600000001 |
| 11 | 2538767161403058526617600000001 |
| 12 | 52643875858853821607942553600000001 |
| 13 | 1503561738404723998944447273369600000001 |
[2,2,17,1297,331777,207360001,268738560001, 645241282560001,2642908293365760001, 17340121312772751360001, 173401213127727513600000001, 2538767161403058526617600000001, 52643875858853821607942553600000001, 1503561738404723998944447273369600000001] |