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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 1321 |
| 5 | 54151 |
| 6 | 152461 |
| 7 | 3589741 |
| 8 | 4102561 |
| 9 | 116645455081 |
| 10 | 4344917276701 |
| 11 | 20825699190451 |
| 12 | 852277147361641 |
| 13 | 11417019330356641 |
[2,3,7,1321,54151,152461,3589741,4102561, 116645455081,4344917276701,20825699190451, 852277147361641,11417019330356641] |