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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 197 |
| 3 | 613 |
| 4 | 13404133 |
| 5 | 24663654373 |
| 6 | 37455569511954513919973 |
| 7 | 448140631309739369262009548799973 |
| 8 | 38794993239276710062728555790335999973 |
[13,197,613,13404133,24663654373, 37455569511954513919973, 448140631309739369262009548799973, 38794993239276710062728555790335999973] |