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 | 1 |
| 6 | 36 |
| 7 | 882 |
| 8 | 18816 |
| 9 | 381024 |
| 10 | 7620480 |
| 11 | 153679680 |
| 12 | 3161410560 |
| 13 | 66784798080 |
| 14 | 1454424491520 |
| 15 | 32724551059200 |
| 16 | 761589551923200 |
| 17 | 18341615042150400 |
| 18 | 457129482588979200 |
| 19 | 11787410229615820800 |
| 20 | 314330939456421888000 |
| 21 | 8663746518767628288000 |
| 22 | 246661959710796005376000 |