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 | 9 |
| 1 | 797 |
| 2 | 77977 |
| 3 | 7779777 |
| 4 | 777797777 |
| 5 | 77777977777 |
| 6 | 7777779777777 |
| 7 | 777777797777777 |
| 8 | 77777777977777777 |
| 9 | 7777777779777777777 |
| 10 | 777777777797777777777 |
| 11 | 77777777777977777777777 |
| 12 | 7777777777779777777777777 |
| 13 | 777777777777797777777777777 |
| 14 | 77777777777777977777777777777 |
| 15 | 7777777777777779777777777777777 |