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 | 11 |
| 2 | 331 |
| 3 | 2221 |
| 4 | 33331 |
| 5 | 333331 |
| 6 | 3333331 |
| 7 | 33333331 |
| 8 | 30303030303030301 |
| 9 | 6666666661 |
| 10 | 44444444441 |
| 11 | 555555555551 |
| 12 | 5555555555551 |
| 13 | 252525252525252525252525251 |
| 14 | 42424242424242424242424242421 |
| 15 | 1717171717171717171717171717171 |