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 | 1 |
| 2 | 12 |
| 3 | 121 |
| 4 | 1211 |
| 5 | 12112 |
| 6 | 121121 |
| 7 | 1211212 |
| 8 | 12112121 |
| 9 | 121121211 |
| 10 | 1211212112 |
| 11 | 12112121121 |
| 12 | 121121211211 |
| 13 | 1211212112112 |
| 14 | 12112121121121 |
| 15 | 121121211211212 |
| 16 | 1211212112112121 |
| 17 | 12112121121121211 |
| 18 | 121121211211212112 |
| 19 | 1211212112112121121 |
| 20 | 12112121121121211212 |