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 | 44994949 |
| 2 | 49444999 |
| 3 | 49494499 |
| 4 | 49499449 |
| 5 | 94449499 |
| 6 | 4449449999 |
| 7 | 4449494999 |
| 8 | 4494494999 |
| 9 | 4494499949 |
| 10 | 4494949499 |
| 11 | 4494994499 |
| 12 | 4499449949 |
| 13 | 4499494949 |
| 14 | 4499944949 |
| 15 | 4944499949 |
| 16 | 4949444999 |
| 17 | 4994449949 |
| 18 | 9444499949 |
| 19 | 9444994499 |
| 20 | 9449494499 |
| 21 | 9449494949 |
| 22 | 9499444499 |
| 23 | 9944944949 |