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 | -26 |
| 2 | 299 |
| 3 | -2002 |
| 4 | 8827 |
| 5 | -29406 |
| 6 | 93184 |
| 7 | -320996 |
| 8 | 1039753 |
| 9 | -2889432 |
| 10 | 7786272 |
| 11 | -22551126 |
| 12 | 62828467 |
| 13 | -158350636 |
| 14 | 399157837 |
| 15 | -1050026250 |
| 16 | 2646932132 |
| 17 | -6320963454 |
| 18 | 15276388101 |
| 19 | -37320661638 |
| 20 | 88295712804 |