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 | 4 |
| 2 | 12 |
| 3 | 24 |
| 4 | 72 |
| 5 | 360 |
| 6 | 360 |
| 7 | 2520 |
| 8 | 2520 |
| 9 | 5040 |
| 10 | 5040 |
| 11 | 5040 |
| 12 | 5040 |
| 13 | 55440 |
| 14 | 55440 |
| 15 | 277200 |
| 16 | 3603600 |
| 17 | 10810800 |
| 18 | 10810800 |
| 19 | 10810800 |
| 20 | 21621600 |
| 21 | 21621600 |
| 22 | 367567200 |
| 23 | 367567200 |
| 24 | 367567200 |
| 25 | 6983776800 |
| 26 | 6983776800 |
| 27 | 6983776800 |
| 28 | 6983776800 |
| 29 | 6983776800 |