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 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | -8 |
| 6 | 0 |
| 7 | 8 |
| 8 | -1 |
| 9 | -1 |
| 10 | 9 |
| 11 | -45 |
| 12 | 0 |
| 13 | 45 |
| 14 | -9 |
| 15 | 1 |
| 16 | 3 |
| 17 | -32 |
| 18 | 168 |
| 19 | -672 |
| 20 | 0 |
| 21 | 672 |
| 22 | -168 |
| 23 | 32 |
| 24 | -3 |