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) |
|---|---|
| 5 | 24 |
| 6 | 3648 |
| 7 | 90384 |
| 8 | 1304576 |
| 9 | 19958400 |
| 10 | 311592960 |
| 11 | 5054353920 |
| 12 | 85709352960 |
| 13 | 1523221539840 |
| 14 | 28387834675200 |
| 15 | 554575551129600 |
| 16 | 11345938174771200 |
| 17 | 242796629621145600 |
| 18 | 5427273747293798400 |
| 19 | 126546947417899008000 |