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 | -5 |
| 3 | -5 |
| 4 | -1 |
| 5 | 35 |
| 6 | 66 |
| 7 | 100 |
| 8 | 15 |
| 9 | -330 |
| 10 | -841 |
| 11 | -1591 |
| 12 | -1468 |
| 13 | 426 |
| 14 | 6306 |
| 15 | 16399 |
| 16 | 27745 |
| 17 | 31544 |
| 18 | 6364 |
| 19 | -70389 |
| 20 | -225322 |
| 21 | -435265 |
| 22 | -617937 |
| 23 | -537135 |
| 24 | 176008 |
| 25 | 1970213 |
| 26 | 5150080 |
| 27 | 9277624 |
| 28 | 12631298 |
| 29 | 11048049 |
| 30 | -1884235 |
| 31 | -34460900 |
| 32 | -92385183 |
| 33 | -171971785 |
| 34 | -247790333 |