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) |
|---|---|
| 0 | 99 |
| 1 | 979 |
| 2 | 9779 |
| 3 | 97779 |
| 4 | 977779 |
| 5 | 9777779 |
| 6 | 97777779 |
| 7 | 977777779 |
| 8 | 9777777779 |
| 9 | 97777777779 |
| 10 | 977777777779 |
| 11 | 9777777777779 |
| 12 | 97777777777779 |
| 13 | 977777777777779 |
| 14 | 9777777777777779 |
| 15 | 97777777777777779 |
| 16 | 977777777777777779 |
| 17 | 9777777777777777779 |
| 18 | 97777777777777777779 |
| 19 | 977777777777777777779 |