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 | 989999 |
| 2 | 1799999 |
| 3 | 1889999 |
| 4 | 1988999 |
| 5 | 1989899 |
| 6 | 1989989 |
| 7 | 1997999 |
| 8 | 1999799 |
| 9 | 1999889 |
| 10 | 1999979 |
| 11 | 2699999 |
| 12 | 2799899 |
| 13 | 2799989 |
| 14 | 2879999 |
| 15 | 2899997 |
| 16 | 2978999 |
| 17 | 2979989 |
| 18 | 2988899 |
| 19 | 2989799 |
| 20 | 2989997 |
| 21 | 2998997 |
| 22 | 2999879 |
| 23 | 2999897 |
| 24 | 3698999 |
| 25 | 3789899 |