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 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 8 |
| 6 | 96 |
| 7 | 192 |
| 8 | 2304 |
| 9 | 13824 |
| 10 | 207360 |
| 11 | 829440 |
| 12 | 24883200 |
| 13 | 99532800 |
| 14 | 2786918400 |
| 15 | 31352832000 |
| 16 | 501645312000 |
| 17 | 4013162496000 |
| 18 | 192631799808000 |
| 19 | 1155790798848000 |
| 20 | 52010585948160000 |
| 21 | 728148203274240000 |
| 22 | 19223112566439936000 |
| 23 | 192231125664399360000 |