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 | 1 |
| 1 | -2 |
| 2 | -16 |
| 3 | -204 |
| 4 | -3264 |
| 5 | -60384 |
| 6 | -1239912 |
| 7 | -27591408 |
| 8 | -655324704 |
| 9 | -16443029408 |
| 10 | -432731364992 |
| 11 | -11882079044992 |
| 12 | -339084517212576 |
| 13 | -10026995732141760 |
| 14 | -306530743192692480 |
| 15 | -9669854410016300160 |
| 16 | -314315622535266332160 |