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) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 122 |
| 3 | 1222 |
| 4 | 12222 |
| 5 | 122222 |
| 6 | 1222222 |
| 7 | 12222222 |
| 8 | 122222222 |
| 9 | 1222222222 |
| 10 | 12222222222 |
| 11 | 122222222222 |
| 12 | 1222222222222 |
| 13 | 12222222222222 |
| 14 | 122222222222222 |
| 15 | 1222222222222222 |
| 16 | 12222222222222222 |
| 17 | 122222222222222222 |
| 18 | 1222222222222222222 |
| 19 | 12222222222222222222 |
| 20 | 122222222222222222222 |