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 | 59899999 |
| 2 | 69899899 |
| 3 | 69899989 |
| 4 | 69979999 |
| 5 | 69997999 |
| 6 | 69999799 |
| 7 | 77899999 |
| 8 | 78997999 |
| 9 | 78998989 |
| 10 | 78999889 |
| 11 | 78999979 |
| 12 | 79699999 |
| 13 | 79879999 |
| 14 | 79889899 |
| 15 | 79979899 |
| 16 | 79979989 |
| 17 | 79988899 |
| 18 | 79989979 |
| 19 | 79996999 |
| 20 | 79997899 |
| 21 | 79997989 |