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) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 6 |
| 4 | 718080 |
| 5 | 4260983940 |
| 6 | 2175789895680 |
| 7 | 268832232086250 |
| 8 | 13543515506658816 |
| 9 | 368471361307591080 |
| 10 | 6399096250242170880 |
| 11 | 78976960885082392110 |
| 12 | 745151003161018080000 |
| 13 | 5660706546633925834476 |
| 14 | 35971041412788697313280 |