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) |
|---|---|
| 4 | 0 |
| 5 | 5 |
| 6 | 105372 |
| 7 | 92123514 |
| 8 | 25367820672 |
| 9 | 3777055329267 |