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 | 3 |
| 4 | 36 |
| 5 | 360 |
| 6 | 3600 |
| 7 | 37800 |
| 8 | 423360 |
| 9 | 5080320 |
| 10 | 65318400 |
| 11 | 898128000 |
| 12 | 13172544000 |
| 13 | 205491686400 |
| 14 | 3399953356800 |
| 15 | 59499183744000 |
| 16 | 1098446469120000 |
| 17 | 21341245685760000 |
| 18 | 435361411989504000 |
| 19 | 9305850181275648000 |
| 20 | 208013121699102720000 |
| 21 | 4853639506312396800000 |