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) |
|---|---|
| 3 | 15 |
| 4 | 224 |
| 5 | 1815 |
| 6 | 28716 |
| 7 | 886837 |
| 8 | 46775584 |
| 9 | 4207536351 |