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 | 14 |
| 2 | 144 |
| 3 | 1444 |
| 4 | 14444 |
| 5 | 144444 |
| 6 | 1444444 |
| 7 | 14444444 |
| 8 | 144444444 |
| 9 | 1444444444 |
| 10 | 14444444444 |
| 11 | 144444444444 |
| 12 | 1444444444444 |
| 13 | 14444444444444 |
| 14 | 144444444444444 |
| 15 | 1444444444444444 |
| 16 | 14444444444444444 |
| 17 | 144444444444444444 |
| 18 | 1444444444444444444 |
| 19 | 14444444444444444444 |
| 20 | 144444444444444444444 |