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 | 4 |
| 3 | 121 |
| 4 | 144 |
| 5 | 441 |
| 6 | 1444 |
| 7 | 114244 |
| 8 | 2214144 |
| 9 | 11142244 |
| 10 | 121242121 |
| 11 | 421111441 |
| 12 | 1111422244 |
| 13 | 44424414441 |
| 14 | 111114222244 |
| 15 | 11111142222244 |
| 16 | 214222214414224 |
| 17 | 242441124211441 |
| 18 | 411244411422244 |
| 19 | 1111111422222244 |
| 20 | 2111211444222241 |