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) |
|---|---|
| 1 | 1 |
| 2 | -8 |
| 3 | 73 |
| 4 | -656 |
| 5 | 5905 |
| 6 | -53144 |
| 7 | 478297 |
| 8 | -4304672 |
| 9 | 38742049 |
| 10 | -348678440 |
| 11 | 3138105961 |
| 12 | -28242953648 |
| 13 | 254186582833 |
| 14 | -2287679245496 |
| 15 | 20589113209465 |
| 16 | -185302018885184 |
| 17 | 1667718169966657 |
| 18 | -15009463529699912 |