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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 47 |
| 3 | 5923 |
| 4 | 426457 |
| 5 | 15636757 |
| 6 | 7318002277 |
| 7 | 1536780478171 |
| 8 | 603180793741 |
| 9 | 142957467201379447 |
| 10 | 60042136224579367741 |
| 11 | 10127106976545720025649 |
| 12 | 18228792557782296046168201 |
| 13 | 12796612375563171824410077103 |
| 14 | 3463616416319098507140327535879 |
| 15 | 1380498543075754976417359117871773 |
[1,7,47,5923,426457,15636757,7318002277, 1536780478171,603180793741,142957467201379447, 60042136224579367741,10127106976545720025649, 18228792557782296046168201, 12796612375563171824410077103, 3463616416319098507140327535879, 1380498543075754976417359117871773] |