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) |
|---|---|
| 2 | 1 |
| 3 | 13 |
| 4 | 184 |
| 5 | 3040 |
| 6 | 58360 |
| 7 | 1283800 |
| 8 | 31917760 |
| 9 | 886123840 |
| 10 | 27192323200 |
| 11 | 914387689600 |
| 12 | 33446228569600 |
| 13 | 1322364153510400 |
| 14 | 56203860301388800 |
| 15 | 2555756347720576000 |
| 16 | 123819357959385088000 |
| 17 | 6367367706293321728000 |