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 | 2 |
| 1 | 424 |
| 2 | 44244 |
| 3 | 4442444 |
| 4 | 444424444 |
| 5 | 44444244444 |
| 6 | 4444442444444 |
| 7 | 444444424444444 |
| 8 | 44444444244444444 |
| 9 | 4444444442444444444 |
| 10 | 444444444424444444444 |
| 11 | 44444444444244444444444 |
| 12 | 4444444444442444444444444 |
| 13 | 444444444444424444444444444 |
| 14 | 44444444444444244444444444444 |
| 15 | 4444444444444442444444444444444 |