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 | -504 |
| 2 | -16632 |
| 3 | -122976 |
| 4 | -532728 |
| 5 | -1575504 |
| 6 | -4058208 |
| 7 | -8471232 |
| 8 | -17047800 |
| 9 | -29883672 |
| 10 | -51991632 |
| 11 | -81170208 |
| 12 | -129985632 |
| 13 | -187132176 |
| 14 | -279550656 |
| 15 | -384422976 |
| 16 | -545530104 |
| 17 | -715608432 |
| 18 | -986161176 |
| 19 | -1247954400 |
| 20 | -1665307728 |
| 21 | -2066980608 |
| 22 | -2678616864 |
| 23 | -3243917376 |
| 24 | -4159663200 |