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 | 6 |
| 2 | 60 |
| 3 | 90 |
| 4 | 264 |
| 5 | 3960 |
| 6 | 4560 |
| 7 | 8736 |
| 8 | 13770 |
| 9 | 131040 |
| 10 | 384384 |
| 11 | 605880 |
| 12 | 5765760 |
| 13 | 20049120 |
| 14 | 882161280 |
| 15 | 23253135360 |