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 | 6 |
| 2 | -1886 |
| 3 | -34380 |
| 4 | 10668396 |
| 5 | 328323816 |
| 6 | -100553342664 |
| 7 | -4389550302096 |
| 8 | 1326507370388880 |
| 9 | 75452769667361376 |
| 10 | -22493207874982677984 |
| 11 | -1585161480256581714624 |
| 12 | 466040432011344287649984 |
| 13 | 39356406972705866391987840 |
| 14 | -11408347792399213172870573184 |