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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 226800 |
| 11 | 2494800 |
| 12 | 29937600 |
| 13 | 259459200 |
| 14 | 1816214400 |
| 15 | 10897286400 |
| 16 | 301491590400 |
| 17 | 4419628012800 |
| 18 | 51209462304000 |
| 19 | 482551041772800 |
| 20 | 6979977625420800 |
| 21 | 92611036249804800 |
| 22 | 2078225819199129600 |