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 | 4 |
| 2 | 22 |
| 3 | 666 |
| 4 | 1111 |
| 5 | 6666666 |
| 6 | 4444444444 |
| 7 | 44444444444444444444 |
| 8 | 555555555555555555555555555 |
| 9 | 55555555555555555555555555555555 |
| 10 | 4444444444444444444444444444444444444444444444444444444 |