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 | 1 |
| 3 | -72 |
| 4 | -194400 |
| 5 | -28866400 |
| 6 | 13994100 |
| 7 | 9650004336 |
| 8 | -99683138560 |
| 9 | -1007380800 |
| 10 | 5570606272950 |
| 11 | -32186306471000 |
| 12 | -2717893793664 |
| 13 | 724443400725408 |
| 14 | -2662202398202200 |
| 15 | -401005712372400 |
| 16 | 19385312101171200 |
| 17 | 24633489938571456 |
| 18 | -449375771787124707 |