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 | 8 |
| 4 | 45 |
| 5 | 144 |
| 6 | 105 |
| 7 | 17280 |
| 8 | 14175 |
| 9 | 5600 |
| 10 | 12474 |
| 11 | 1935360 |
| 12 | 1576575 |
| 13 | 28740096000 |
| 14 | 156370500 |
| 15 | 688816128 |
| 16 | 97692469875 |
| 17 | 26900729856000 |
| 18 | 158428270000 |
| 19 | 32593902501888000 |
| 20 | 3430178002251 |
| 21 | 1798063128576000 |
| 22 | 988320969417600 |
| 23 | 809280523999877529600000 |
| 24 | 461635966995328125 |