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 | 3333311 |
| 3 | 7771717 |
| 4 | 11818181 |
| 5 | 515115551 |
| 6 | 727722727 |
| 7 | 887887787 |
| 8 | 1110011101 |
| 9 | 1161611161 |
| 10 | 1411111441 |
| 11 | 1411141411 |
| 12 | 1717117117 |
| 13 | 1911999919 |
| 14 | 3311113111 |
| 15 | 3313133311 |
| 16 | 3333353533 |
| 17 | 5151111551 |
| 18 | 5555115151 |
| 19 | 5777777557 |
| 20 | 7373733337 |
| 21 | 7747447777 |
| 22 | 7777111777 |
| 23 | 8887788787 |
| 24 | 9199119991 |
| 25 | 9994449499 |