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 | 7 |
| 2 | 89 |
| 3 | 887 |
| 4 | 8887 |
| 5 | 88883 |
| 6 | 888887 |
| 7 | 8888861 |
| 8 | 88888883 |
| 9 | 888888887 |
| 10 | 8888888809 |
| 11 | 88888888801 |
| 12 | 888888888887 |
| 13 | 8888888888849 |
| 14 | 88888888888889 |
| 15 | 888888888888883 |
| 16 | 8888888888888647 |
| 17 | 88888888888888889 |
| 18 | 888888888888888809 |
| 19 | 8888888888888888881 |
| 20 | 88888888888888888867 |
| 21 | 888888888888888888683 |