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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 41 |
| 4 | 331 |
| 5 | 3001 |
| 6 | 42043 |
| 7 | 919913 |
| 8 | 19734581 |
| 9 | 440817757 |
| 10 | 12501968177 |
| 11 | 435748987787 |
| 12 | 19638537755027 |
| 13 | 692919372869953 |
| 14 | 30634679101122821 |
| 15 | 1695313841631390713 |
[1,7,41,331,3001,42043,919913,19734581,440817757, 12501968177,435748987787,19638537755027, 692919372869953,30634679101122821, 1695313841631390713] |