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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 58 |
| 4 | 555 |
| 5 | 5686 |
| 6 | 61510 |
| 7 | 692084 |
| 8 | 8029491 |
| 9 | 95474398 |
| 10 | 1158542962 |
| 11 | 14301359788 |
| 12 | 59716352682 |
| 13 | 2272903748636 |
| 14 | 29160850916204 |
| 15 | 377850135826408 |
| 16 | 4939485500738195 |
| 17 | 65088291655161454 |
| 18 | 863887932803327098 |
| 19 | 11541609784040120316 |
| 20 | 170640229753234495001 |
[1,7,58,555,5686,61510,692084,8029491,95474398, 1158542962,14301359788,59716352682,2272903748636, 29160850916204,377850135826408,4939485500738195, 65088291655161454,863887932803327098, 11541609784040120316,170640229753234495001] |