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 | 89 |
| 2 | 8999 |
| 3 | 89899 |
| 4 | 89989 |
| 5 | 98899 |
| 6 | 98999 |
| 7 | 99989 |
| 8 | 888989 |
| 9 | 898889 |
| 10 | 989999 |
| 11 | 998989 |
| 12 | 8888989 |
| 13 | 8889889 |
| 14 | 8988989 |
| 15 | 8989999 |
| 16 | 8998889 |
| 17 | 8999899 |
| 18 | 9888889 |
| 19 | 9889889 |
| 20 | 9899999 |
| 21 | 9989899 |
| 22 | 9999889 |
| 23 | 88888999 |
| 24 | 88898989 |
| 25 | 88989899 |
| 26 | 89888989 |
| 27 | 89889889 |
| 28 | 89898889 |
| 29 | 89999999 |
| 30 | 98888989 |