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 | 2 |
| 3 | 4 |
| 4 | 12 |
| 5 | 24 |
| 6 | 120 |
| 7 | 360 |
| 8 | 720 |
| 9 | 5040 |
| 10 | 10080 |
| 11 | 30240 |
| 12 | 332640 |
| 13 | 1663200 |
| 14 | 3326400 |
| 15 | 43243200 |
| 16 | 129729600 |
| 17 | 259459200 |
| 18 | 4410806400 |
| 19 | 30875644800 |
| 20 | 586637251200 |
| 21 | 1173274502400 |
| 22 | 26985313555200 |
| 23 | 134926567776000 |
| 24 | 404779703328000 |
| 25 | 11738611396512000 |
| 26 | 363896953291872000 |