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 | 2 |
| 2 | -2 |
| 3 | -16 |
| 4 | -10 |
| 5 | 118 |
| 6 | 304 |
| 7 | -500 |
| 8 | -3754 |
| 9 | -2488 |
| 10 | 30866 |
| 11 | 83716 |
| 12 | -135568 |
| 13 | -1080972 |
| 14 | -792876 |
| 15 | 9090484 |
| 16 | 25788118 |
| 17 | -39325156 |
| 18 | -335074520 |
| 19 | -271779024 |
| 20 | 2820643842 |
| 21 | 8348113120 |
| 22 | -11788972644 |
| 23 | -107836934448 |
| 24 | -96107852032 |
| 25 | 900943403012 |
| 26 | 2778574561276 |
| 27 | -3596374190416 |