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 | 0 |
| 2 | -7 |
| 3 | 128 |
| 4 | -975 |
| 5 | 4608 |
| 6 | -16340 |
| 7 | 48384 |
| 8 | -124303 |
| 9 | 281600 |
| 10 | -583746 |
| 11 | 1146240 |
| 12 | -2125108 |
| 13 | 3691008 |
| 14 | -6151880 |
| 15 | 10055424 |
| 16 | -15914895 |
| 17 | 24136704 |
| 18 | -35748899 |
| 19 | 52583040 |
| 20 | -75877938 |
| 21 | 105994240 |
| 22 | -145580124 |
| 23 | 200279808 |
| 24 | -272040500 |
| 25 | 359036928 |
| 26 | -468767690 |
| 27 | 615599360 |