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 | 2 |
| 2 | 4 |
| 3 | 24 |
| 4 | 16 |
| 5 | 80 |
| 6 | 720 |
| 7 | 288 |
| 8 | 480 |
| 9 | 3552 |
| 10 | 40320 |
| 11 | 11520 |
| 12 | 11520 |
| 13 | 28416 |
| 14 | 271104 |
| 15 | 3628800 |
| 16 | 806400 |
| 17 | 576000 |
| 18 | 852480 |
| 19 | 2711040 |
| 20 | 31342080 |
| 21 | 479001600 |
| 22 | 87091200 |
| 23 | 48384000 |
| 24 | 51148800 |
| 25 | 97597440 |
| 26 | 376104960 |
| 27 | 5087692800 |
| 28 | 87178291200 |