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 | 2 |
| 2 | 40 |
| 3 | 6960 |
| 4 | 10340736 |
| 5 | 129599358720 |
| 6 | 13527918439695360 |