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 | 16 |
| 2 | -194 |
| 3 | -17504 |
| 4 | -18164 |
| 5 | 31216576 |
| 6 | 540334216 |
| 7 | -75639407744 |
| 8 | -2912283304304 |
| 9 | 225705335009536 |
| 10 | 15406032742583776 |
| 11 | -769177483661571584 |
| 12 | -88566701814374836544 |
| 13 | 2736491182742489168896 |
| 14 | 561899064537972620484736 |
| 15 | -8249509418670119836289024 |