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 | 8 |
| 3 | 66 |
| 4 | 768 |
| 5 | 11040 |
| 6 | 190800 |
| 7 | 3845520 |
| 8 | 88583040 |
| 9 | 2295578880 |
| 10 | 66098592000 |
| 11 | 2093556326400 |
| 12 | 72337863628800 |
| 13 | 2707751497651200 |
| 14 | 109153235884492800 |
| 15 | 4714413247095552000 |
| 16 | 217193790828478464000 |
| 17 | 10631538129843671040000 |