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) |
|---|---|
| 2 | 6 |
| 3 | 8 |
| 4 | 15 |
| 5 | 144 |
| 6 | 280 |
| 7 | 640 |
| 8 | 14175 |
| 9 | 2240 |
| 10 | 199584 |
| 11 | 87091200 |
| 12 | 875875 |
| 13 | 22353408000 |
| 14 | 5003856000 |
| 15 | 229605376 |
| 16 | 10854718875 |
| 17 | 941525544960000 |
| 18 | 1013940928000 |
| 19 | 3064383995904000 |
| 20 | 82324272054024 |
| 21 | 2996771880960000 |
| 22 | 255484332230400000 |
| 23 | 809280523999877529600000 |
| 24 | 5699209469078125 |