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 | -302 |
| 3 | -5868 |
| 4 | 271020 |
| 5 | 9559656 |
| 6 | -400665864 |
| 7 | -21790977552 |
| 8 | 817229568912 |
| 9 | 63826180714080 |
| 10 | -2103055264345824 |
| 11 | -228350822399665344 |
| 12 | 6449054538439781568 |
| 13 | 964885262883681324672 |
| 14 | -22547834064602312261760 |
| 15 | -4701124068353193901918464 |
| 16 | 86110774297414559755612416 |