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 | 19999999 |
| 2 | 29999899 |
| 3 | 29999989 |
| 4 | 39979999 |
| 5 | 39999979 |
| 6 | 47999899 |
| 7 | 48899899 |
| 8 | 48989989 |
| 9 | 48997999 |
| 10 | 48999799 |
| 11 | 48999889 |
| 12 | 49989799 |
| 13 | 49999699 |
| 14 | 49999897 |
| 15 | 56999989 |
| 16 | 58799899 |
| 17 | 58898989 |
| 18 | 58988899 |
| 19 | 58997899 |
| 20 | 59698999 |
| 21 | 59788999 |