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) |
|---|---|
| 0 | 2 |
| 1 | 1440 |
| 2 | 5225472000 |
| 3 | 455547719673446400000 |
| 4 | 2916586742141623158009180979200000000 |
| 5 | 3278245620793706216637861108629164518335840256000000000000 |