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 | 56 |
| 2 | 552 |
| 3 | 5550 |
| 4 | 5055752 |
| 5 | 5255556 |
| 6 | 552555542 |
| 7 | 2555555256 |
| 8 | 551555015556 |
| 9 | 5555555065506 |
| 10 | 515605555595550 |
| 11 | 5558455555057550 |
| 12 | 495553555055055552 |
| 13 | 555055556595557556 |
| 14 | 15975555555558555452 |
| 15 | 5525459555405553555552 |
| 16 | 59555925551555575555056 |
| 17 | 255555555455525595515520 |