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 | -8 |
| 2 | -80 |
| 3 | -656 |
| 4 | -5264 |
| 5 | -42128 |
| 6 | -337040 |
| 7 | -2696336 |
| 8 | -21570704 |
| 9 | -172565648 |
| 10 | -1380525200 |
| 11 | -11044201616 |
| 12 | -88353612944 |
| 13 | -706828903568 |
| 14 | -5654631228560 |
| 15 | -45237049828496 |
| 16 | -361896398627984 |
| 17 | -2895171189023888 |
| 18 | -23161369512191120 |