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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 31 |
| 3 | 631 |
| 4 | 10631 |
| 5 | 1510631 |
| 6 | 211510631 |
| 7 | 28211510631 |
| 8 | 3628211510631 |
| 9 | 453628211510631 |
| 10 | 55453628211510631 |
| 11 | 6655453628211510631 |
| 12 | 786655453628211510631 |
| 13 | 91786655453628211510631 |
| 14 | 10591786655453628211510631 |
| 15 | 12010591786655453628211510631 |
[1,31,631,10631,1510631,211510631,28211510631, 3628211510631,453628211510631,55453628211510631, 6655453628211510631,786655453628211510631, 91786655453628211510631, 10591786655453628211510631, 12010591786655453628211510631] |