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 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 120 |
| 6 | 720 |
| 7 | 2520 |
| 8 | 6720 |
| 9 | 15120 |
| 10 | 30240 |
| 11 | 55440 |
| 12 | 95040 |
| 13 | 154440 |
| 14 | 240240 |
| 15 | 360360 |
| 16 | 524160 |
| 17 | 742560 |
| 18 | 1028160 |
| 19 | 1395360 |
| 20 | 1860480 |
| 21 | 2441880 |
| 22 | 3160080 |
| 23 | 4037880 |
| 24 | 5100480 |
| 25 | 6375600 |
| 26 | 7893600 |
| 27 | 9687600 |
| 28 | 11793600 |
| 29 | 14250600 |
| 30 | 17100720 |
| 31 | 20389320 |
| 32 | 24165120 |
| 33 | 28480320 |
| 34 | 33390720 |