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 | 2 |
| 1 | 11 |
| 2 | 89 |
| 3 | 907 |
| 4 | 8893 |
| 5 | 88897 |
| 6 | 888917 |
| 7 | 8888927 |
| 8 | 88888901 |
| 9 | 888888901 |
| 10 | 8888888891 |
| 11 | 88888888901 |
| 12 | 888888888919 |
| 13 | 8888888888921 |
| 14 | 88888888888889 |
| 15 | 888888888888907 |
| 16 | 8888888888888927 |
| 17 | 88888888888888889 |
| 18 | 888888888888888947 |