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 | 24 |
| 4 | 240 |
| 5 | 1080 |
| 6 | 3360 |
| 7 | 8400 |
| 8 | 18144 |
| 9 | 35280 |
| 10 | 63360 |
| 11 | 106920 |
| 12 | 171600 |
| 13 | 264264 |
| 14 | 393120 |
| 15 | 567840 |
| 16 | 799680 |
| 17 | 1101600 |
| 18 | 1488384 |
| 19 | 1976760 |
| 20 | 2585520 |
| 21 | 3335640 |
| 22 | 4250400 |
| 23 | 5355504 |
| 24 | 6679200 |
| 25 | 8252400 |
| 26 | 10108800 |
| 27 | 12285000 |
| 28 | 14820624 |
| 29 | 17758440 |
| 30 | 21144480 |