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 | 12 |
| 2 | 624 |
| 3 | 72768 |
| 4 | 15073536 |
| 5 | 4879690752 |
| 6 | 2275446779904 |
| 7 | 1444596033404928 |
| 8 | 1198103353905709056 |
| 9 | 1257795823373397000192 |
| 10 | 1630379271356490615619584 |
| 11 | 2557344389023281412086693888 |
| 12 | 4774145871907749099664809394176 |