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 | 5 |
| 4 | 27 |
| 5 | 756 |
| 6 | 800 |
| 7 | 40500 |
| 8 | 165375 |
| 9 | 1509200 |
| 10 | 1524096 |
| 11 | 185749200 |
| 12 | 186763500 |
| 13 | 31696434000 |
| 14 | 31802284800 |
| 15 | 31887679824 |
| 16 | 127830277575 |
| 17 | 37009908936000 |
| 18 | 37066020992000 |
| 19 | 13397976612820800 |
| 20 | 13412613057860016 |
| 21 | 13425208791508800 |