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 | 7 |
| 2 | 108 |
| 3 | 335 |
| 4 | 6667 |
| 5 | 104636 |
| 6 | 333335 |
| 7 | 4504625 |
| 8 | 70585736 |
| 9 | 333333335 |
| 10 | 1818181815 |
| 11 | 33531510511 |
| 12 | 333333333335 |
| 13 | 198817904169 |