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 | 1 |
| 4 | 27 |
| 5 | 1087 |
| 6 | 105123 |
| 7 | 31562520 |
| 8 | 33924554539 |
| 9 | 140306938682875 |