This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 103 |
| 3 | 1153 |
| 4 | 15013 |
| 5 | 255253 |
| 6 | 4849843 |
| 7 | 111546433 |
| 8 | 6581239663 |
| 9 | 467268016213 |
| 10 | 34110565183693 |
| 11 | 2831176910246683 |
| 12 | 251974745011954963 |
| 13 | 24441550266159631603 |
| 14 | 4668336100836489636553 |
| 15 | 1573229265981897007519033 |