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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 251 |
| 3 | 4031 |
| 4 | 52017 |
| 5 | 652039 |
| 6 | 7746369 |
| 7 | 89721621 |
| 8 | 1019145113 |
| 9 | 11401770915 |
| 10 | 126048548239 |
[13,251,4031,52017,652039,7746369,89721621, 1019145113,11401770915,126048548239] |