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) |
|---|---|
| 1 | -1 |
| 2 | -2 |
| 3 | -14 |
| 4 | -180 |
| 5 | -3344 |
| 6 | -80750 |
| 7 | -2394792 |
| 8 | -84150248 |
| 9 | -3417051136 |
| 10 | -157409163162 |
| 11 | -8109659900000 |
| 12 | -462005414448732 |
| 13 | -28837128777928704 |
| 14 | -1956971256267512966 |
| 15 | -143459789419986793600 |
| 16 | -11297467798871681250000 |
| 17 | -951158499840260908777472 |