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 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 1800 |
| 4 | 3528000 |
| 5 | 93350880000 |
| 6 | 34157460395520000 |
| 7 | 176018448722253096960000 |
| 8 | 12957844528516872887046144000000 |
| 9 | 13783997562964632581368087262085120000000 |