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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 1 |
| 6 | -3 |
| 7 | -7 |
| 8 | -8 |
| 9 | -25 |
| 10 | -37 |
| 11 | 47 |
| 12 | 318 |
| 13 | 559 |
| 14 | 2023 |
| 15 | 7039 |
| 16 | -496 |
| 17 | -90431 |
| 18 | -314775 |
| 19 | -1139599 |
| 20 | -8007614 |
| 21 | -13512079 |
| 22 | 154788437 |
| 23 | 1247862041 |
| 24 | 5097732072 |
| 25 | 56844671623 |
| 26 | 290379801907 |
| 27 | -1403230649825 |
| 28 | -32188159859842 |
| 29 | -199066111517153 |