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 | -1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | -6 |
| 6 | 4 |
| 7 | 13 |
| 8 | -13 |
| 9 | -61 |
| 10 | 124 |
| 11 | 120 |
| 12 | -516 |
| 13 | -352 |
| 14 | 2848 |
| 15 | -923 |
| 16 | -11337 |
| 17 | 10165 |
| 18 | 49352 |
| 19 | -88655 |
| 20 | -159903 |
| 21 | 512430 |
| 22 | 450812 |
| 23 | -2873276 |
| 24 | -11660 |
| 25 | 13752804 |
| 26 | -9160464 |
| 27 | -62238760 |
| 28 | 91526344 |
| 29 | 239932224 |
| 30 | -620180224 |
| 31 | -768156379 |
| 32 | 3683079807 |
| 33 | 1168683353 |