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 | 2 |
| 1 | -1 |
| 2 | -8 |
| 3 | 15 |
| 4 | 22 |
| 5 | -104 |
| 6 | 17 |
| 7 | 510 |
| 8 | -721 |
| 9 | -1708 |
| 10 | 5806 |
| 11 | 1503 |
| 12 | -31520 |
| 13 | 31519 |
| 14 | 121778 |
| 15 | -312396 |
| 16 | -233455 |
| 17 | 1885694 |
| 18 | -1152593 |
| 19 | -8196936 |
| 20 | 16079050 |
| 21 | 21867343 |
| 22 | -109306936 |
| 23 | 24246207 |
| 24 | 528076766 |
| 25 | -780482080 |
| 26 | -1726348607 |
| 27 | 6132589566 |
| 28 | 1190594623 |
| 29 | -32799408980 |
| 30 | 34705374038 |
| 31 | 124349675919 |
| 32 | -331866549712 |