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 | 111 |
| 2 | 211 |
| 3 | 111111 |
| 4 | 111211 |
| 5 | 211111 |
| 6 | 211211 |
| 7 | 111111111 |
| 8 | 111111211 |
| 9 | 111211111 |
| 10 | 111211211 |
| 11 | 211111111 |
| 12 | 211111211 |
| 13 | 211211111 |
| 14 | 211211211 |
| 15 | 111111111111 |
| 16 | 111111111111 |
| 17 | 111111111211 |
| 18 | 111111211111 |
| 19 | 111111211211 |
| 20 | 111211111111 |
| 21 | 111211111211 |