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 | -8 |
| 3 | -35 |
| 4 | -27 |
| 5 | -152 |
| 6 | 91 |
| 7 | -252 |
| 8 | -252 |
| 9 | -252 |
| 10 | 873 |
| 11 | -458 |
| 12 | -674 |
| 13 | -2871 |
| 14 | 216 |
| 15 | 3591 |
| 16 | 3591 |
| 17 | -1322 |
| 18 | -1322 |
| 19 | -8181 |
| 20 | -9181 |
| 21 | 80 |
| 22 | 12059 |
| 23 | -108 |
| 24 | -108 |
| 25 | -108 |
| 26 | 19665 |
| 27 | 19665 |
| 28 | 16921 |
| 29 | -7468 |
| 30 | -37843 |
| 31 | -67634 |
| 32 | -67634 |
| 33 | -31697 |
| 34 | 12520 |
| 35 | 55395 |
| 36 | 55395 |
| 37 | 4742 |
| 38 | 66473 |
| 39 | 125792 |
| 40 | 125792 |
| 41 | 56871 |
| 42 | -26478 |