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 | 2 |
| 4 | 6 |
| 5 | 8 |
| 6 | 6 |
| 7 | 24 |
| 8 | 30 |
| 9 | 42 |
| 10 | 24 |
| 11 | 120 |
| 12 | 116 |
| 13 | 216 |
| 14 | 264 |
| 15 | 120 |
| 16 | 720 |
| 17 | 532 |
| 18 | 1002 |
| 19 | 1920 |
| 20 | 1920 |
| 21 | 720 |
| 22 | 5040 |
| 23 | 2848 |
| 24 | 4626 |
| 25 | 11688 |
| 26 | 19200 |
| 27 | 15840 |
| 28 | 5040 |