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) |
|---|---|
| 11 | 20 |
| 12 | 404 |
| 13 | 6164 |
| 14 | 75917 |
| 15 | 835491 |