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 | 11 |
| 1 | 141 |
| 2 | 1441 |
| 3 | 14441 |
| 4 | 144441 |
| 5 | 1444441 |
| 6 | 14444441 |
| 7 | 144444441 |
| 8 | 1444444441 |
| 9 | 14444444441 |
| 10 | 144444444441 |
| 11 | 1444444444441 |
| 12 | 14444444444441 |
| 13 | 144444444444441 |
| 14 | 1444444444444441 |
| 15 | 14444444444444441 |
| 16 | 144444444444444441 |
| 17 | 1444444444444444441 |
| 18 | 14444444444444444441 |