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 | 6 |
| 4 | 80 |
| 5 | 1344 |
| 6 | 27648 |
| 7 | 675840 |
| 8 | 19169280 |
| 9 | 619315200 |
| 10 | 22460497920 |
| 11 | 903704739840 |
| 12 | 39953262182400 |
| 13 | 1925366729932800 |
| 14 | 100453916344320000 |
| 15 | 5641491941897011200 |
| 16 | 339325293097805414400 |
| 17 | 21763622246962692096000 |