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 | 111211 |
| 2 | 112111 |
| 3 | 12122221 |
| 4 | 12222121 |
| 5 | 1111122121 |
| 6 | 1212211111 |
| 7 | 11121211121 |
| 8 | 11212221121 |
| 9 | 12111212111 |
| 10 | 12112221211 |
| 11 | 111122221121 |
| 12 | 111122222111 |
| 13 | 111122222221 |
| 14 | 111211221221 |
| 15 | 111212212211 |
| 16 | 111212222111 |
| 17 | 111222212111 |
| 18 | 111222221111 |
| 19 | 112111211221 |
| 20 | 112122112211 |
| 21 | 112122211121 |