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 | 12 |
| 2 | 420 |
| 3 | 240240 |
| 4 | 36100888223400 |
| 5 | 236453376820564453502272320 |
| 6 | 2225626015166235263233958200740039423756478781341512000 |