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 | 98999 |
| 2 | 99989 |
| 3 | 179999 |
| 4 | 188999 |
| 5 | 189989 |
| 6 | 198899 |
| 7 | 199799 |
| 8 | 199889 |
| 9 | 288989 |
| 10 | 289889 |
| 11 | 297989 |
| 12 | 298799 |
| 13 | 299699 |
| 14 | 299969 |
| 15 | 377999 |
| 16 | 379889 |
| 17 | 379979 |
| 18 | 379997 |
| 19 | 389699 |
| 20 | 389897 |
| 21 | 397799 |
| 22 | 398969 |
| 23 | 399689 |
| 24 | 399887 |
| 25 | 468899 |
| 26 | 469979 |
| 27 | 477899 |
| 28 | 479879 |
| 29 | 487889 |
| 30 | 487979 |