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 | 720 |
| 4 | 9792 |
| 5 | 58800 |
| 6 | 231840 |
| 7 | 705600 |
| 8 | 1800960 |
| 9 | 4046112 |
| 10 | 8251200 |
| 11 | 15594480 |
| 12 | 27720000 |
| 13 | 46846800 |
| 14 | 75889632 |
| 15 | 118591200 |
| 16 | 179665920 |
| 17 | 264955200 |
| 18 | 381594240 |
| 19 | 538190352 |