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 | 4999999 |
| 2 | 5989999 |
| 3 | 6799999 |
| 4 | 6899899 |
| 5 | 6899989 |
| 6 | 6988999 |
| 7 | 6998989 |
| 8 | 6999799 |
| 9 | 6999997 |
| 10 | 7879999 |
| 11 | 7888999 |
| 12 | 7897999 |
| 13 | 7898899 |
| 14 | 7899979 |
| 15 | 7969999 |
| 16 | 7988899 |
| 17 | 7997989 |
| 18 | 7998979 |
| 19 | 8789899 |
| 20 | 8798989 |
| 21 | 8799997 |
| 22 | 8878999 |
| 23 | 8879989 |
| 24 | 8888989 |