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 | 11 |
| 2 | 1111 |
| 3 | 12221 |
| 4 | 23332 |
| 5 | 34443 |
| 6 | 45554 |
| 7 | 56665 |
| 8 | 67776 |
| 9 | 78887 |
| 10 | 89998 |
| 11 | 111111 |
| 12 | 1222221 |
| 13 | 2333332 |
| 14 | 3444443 |
| 15 | 4555554 |
| 16 | 5666665 |
| 17 | 6777776 |
| 18 | 7888887 |
| 19 | 8999998 |
| 20 | 9101019 |
| 21 | 11111111 |
| 22 | 102020201 |
| 23 | 112121211 |
| 24 | 122222221 |
| 25 | 132323231 |
| 26 | 142424241 |
| 27 | 152525251 |
| 28 | 162626261 |
| 29 | 172727271 |
| 30 | 182828281 |