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 | -28 |
| 2 | 350 |
| 3 | -2520 |
| 4 | 11025 |
| 5 | -26180 |
| 6 | 4158 |
| 7 | 184600 |
| 8 | -554400 |
| 9 | 401100 |
| 10 | 1496964 |
| 11 | -3920280 |
| 12 | 1444625 |
| 13 | 6224400 |
| 14 | -4972350 |
| 15 | -7121296 |
| 16 | -8308965 |
| 17 | 50796900 |
| 18 | -8971200 |
| 19 | -121968000 |
| 20 | 94011435 |
| 21 | 80598288 |
| 22 | 20282500 |
| 23 | -175228200 |