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 | 0 |
| 1 | 0 |
| 2 | 24 |
| 3 | 3024 |
| 4 | 524160 |
| 5 | 127512000 |
| 6 | 42072307200 |
| 7 | 18183435621120 |
| 8 | 9993927307714560 |
| 9 | 6816310367682816000 |
| 10 | 5653408585997652480000 |
| 11 | 5606015030436835542528000 |
| 12 | 6551662594343454506664345600 |
| 13 | 8914054345090074511550572953600 |
| 14 | 13970892529731225585461744812032000 |