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 | 0 |
| 2 | 96 |
| 3 | 1536 |
| 4 | 15360 |
| 5 | 122880 |
| 6 | 860160 |
| 7 | 5505024 |
| 8 | 33030144 |
| 9 | 188743680 |
| 10 | 1038090240 |
| 11 | 5536481280 |
| 12 | 28789702656 |
| 13 | 146565758976 |
| 14 | 732828794880 |
| 15 | 3607772528640 |
| 16 | 17523466567680 |
| 17 | 84112639524864 |
| 18 | 399535037743104 |
| 19 | 1880164883496960 |
| 20 | 8774102789652480 |
| 21 | 40637949762600960 |