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 | -264 |
| 1 | -3456 |
| 2 | 0 |
| 3 | -23520 |
| 4 | 12600 |
| 5 | -88704 |
| 6 | 68544 |
| 7 | -250560 |
| 8 | 225720 |
| 9 | -591360 |
| 10 | 576576 |
| 11 | -1231776 |
| 12 | 1255800 |
| 13 | -2338560 |
| 14 | 2448000 |
| 15 | -4132224 |
| 16 | 4395384 |
| 17 | -6894720 |
| 18 | 7405440 |
| 19 | -10977120 |
| 20 | 11858616 |
| 21 | -16807296 |
| 22 | 18216000 |
| 23 | -24897600 |
| 24 | 27027000 |
| 25 | -35852544 |
| 26 | 38937024 |
| 27 | -50376480 |
| 28 | 54695160 |
| 29 | -69281280 |
| 30 | 75161856 |