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 | 120 |
| 2 | 120 |
| 3 | 60 |
| 4 | 840 |
| 5 | 15120 |
| 6 | 332640 |
| 7 | 55440 |
| 8 | 7920 |
| 9 | 2162160 |
| 10 | 240240 |
| 11 | 98017920 |
| 12 | 8910720 |
| 13 | 253955520 |
| 14 | 19535040 |
| 15 | 1395360 |
| 16 | 19769460480 |
| 17 | 1235591280 |
| 18 | 72681840 |
| 19 | 4037880 |
| 20 | 212520 |
| 21 | 4475671200 |
| 22 | 173059286400 |
| 23 | 7866331200 |
| 24 | 342014400 |
| 25 | 14250600 |
| 26 | 19033511777280 |
| 27 | 732058145280 |