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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 161 |
| 4 | 6989 |
| 5 | 889769 |
| 6 | 145034861 |
| 7 | 42816875729 |
| 8 | 15196271678069 |
| 9 | 8132911703794601 |
| 10 | 6790008314246422541 |
| 11 | 6567054920481119894801 |
| 12 | 8950073675937467308565669 |
| 13 | 15100141203716305943432625689 |
[1,5,161,6989,889769,145034861,42816875729, 15196271678069,8132911703794601, 6790008314246422541,6567054920481119894801, 8950073675937467308565669, 15100141203716305943432625689] |