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 | 6 |
| 2 | 12 |
| 3 | 120 |
| 4 | 432 |
| 5 | 864 |
| 6 | 1728 |
| 7 | 3456 |
| 8 | 6912 |
| 9 | 931328 |
| 10 | 4357120 |
| 11 | 19789824 |
| 12 | 249753600 |
| 13 | 499507200 |
| 14 | 1272561664 |
| 15 | 5226070016 |
| 16 | 10452140032 |
| 17 | 351882051584 |
| 18 | 1215818366976 |
| 19 | 3364158439424 |
| 20 | 6953815244800 |
| 21 | 13907630489600 |
| 22 | 27815260979200 |
| 23 | 55630521958400 |
| 24 | 1343005923475456 |