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 | 6 |
| 4 | 8 |
| 5 | 2 |
| 6 | 14 |
| 7 | 20 |
| 8 | 24 |
| 9 | 2304 |
| 10 | 2304 |
| 11 | 11664 |
| 12 | 1512 |
| 13 | 2688 |
| 14 | 112896 |
| 15 | 508032 |
| 16 | 18579456 |
| 17 | 87091200 |
| 18 | 11854080 |
| 19 | 368640 |
| 20 | 6967296 |
| 21 | 22861440 |
| 22 | 542126592 |
| 23 | 1872809164800 |
| 24 | 40633270272 |
| 25 | 559872000 |
| 26 | 26873856000 |
| 27 | 8561413324800 |
| 28 | 178362777600 |