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 | 189997999 |
| 2 | 199799989 |
| 3 | 199898899 |
| 4 | 199997899 |
| 5 | 199997989 |
| 6 | 199998889 |
| 7 | 268999999 |
| 8 | 269998999 |
| 9 | 278989999 |
| 10 | 278999989 |
| 11 | 279889999 |
| 12 | 279988999 |
| 13 | 287998999 |
| 14 | 287999989 |
| 15 | 288998989 |
| 16 | 288999889 |
| 17 | 288999979 |
| 18 | 289699999 |
| 19 | 289789999 |
| 20 | 289889989 |