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) |
|---|---|
| 2 | 1 |
| 3 | -15 |
| 4 | 235 |
| 5 | -4200 |
| 6 | 86020 |
| 7 | -2001055 |
| 8 | 52305780 |
| 9 | -1520815230 |
| 10 | 48747603100 |
| 11 | -1709228504170 |
| 12 | 65115320810260 |
| 13 | -2679459929923699 |
| 14 | 118482699493123571 |
| 15 | -5604477255138004835 |
| 16 | 282449438671531808676 |
| 17 | -15111729578894643263239 |