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 | 92 |
| 3 | -1623 |
| 4 | 31991 |
| 5 | -673903 |
| 6 | 14855765 |
| 7 | -338444182 |
| 8 | 7905221248 |
| 9 | -188294015986 |
| 10 | 4556160266218 |
| 11 | -111682969647780 |
| 12 | 2767470863606632 |
| 13 | -69211374967753668 |
| 14 | 1744655539982525892 |
| 15 | -44282217426880817943 |
| 16 | 1130756774785983371727 |