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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 37 |
| 4 | 497 |
| 5 | 14033 |
| 6 | 813857 |
| 7 | 95996993 |
| 8 | 22913626241 |
| 9 | 11034472530177 |
| 10 | 10699863490757121 |
| 11 | 20863301244829828097 |
| 12 | 81721932792141693585409 |
| 13 | 642577422892784159654154241 |
| 14 | 10136733849914528413869372612609 |
[1,2,6,37,497,14033,813857,95996993,22913626241, 11034472530177,10699863490757121, 20863301244829828097,81721932792141693585409, 642577422892784159654154241, 10136733849914528413869372612609] |