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 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 864 |
| 5 | 43200000 |
| 6 | 272097792000000000 |
| 7 | 3416681839784939886182400000000000 |
| 8 | 1847600699255039694224318542233446367734016245760000000000000000 |