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) |
|---|---|
| 3 | 96 |
| 4 | 360 |
| 5 | 1440 |
| 6 | 7120 |
| 7 | 37728 |
| 8 | 196488 |
| 9 | 974592 |
| 10 | 4536000 |
| 11 | 19934208 |
| 12 | 82689264 |
| 13 | 322437312 |
| 14 | 1171745280 |
| 15 | 3924079104 |
| 16 | 11964375936 |
| 17 | 32761139328 |
| 18 | 79244294016 |
| 19 | 165800420352 |
| 20 | 291640320576 |
| 21 | 413774810112 |
| 22 | 443415854592 |
| 23 | 318534709248 |
| 24 | 114869295744 |