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 | 2 |
| 3 | 3 |
| 4 | 3 |
| 5 | 60 |
| 6 | 360 |
| 7 | 70 |
| 8 | 1680 |
| 9 | 3780 |
| 10 | 75600 |
| 11 | 138600 |
| 12 | 285120 |
| 13 | 129729600 |
| 14 | 363242880 |
| 15 | 3405402000 |
| 16 | 1009008000 |
| 17 | 308756448000 |
| 18 | 5557616064000 |
| 19 | 52797352608000 |
| 20 | 351982350720000 |
| 21 | 221748880953600 |
| 22 | 1524523556556000 |
| 23 | 738190353700800 |
| 24 | 13464592051502592000 |