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 | -7 |
| 2 | 32 |
| 3 | -114 |
| 4 | 350 |
| 5 | -967 |
| 6 | 2468 |
| 7 | -5916 |
| 8 | 13471 |
| 9 | -29384 |
| 10 | 61784 |
| 11 | -125838 |
| 12 | 249230 |
| 13 | -481506 |
| 14 | 909788 |
| 15 | -1684824 |
| 16 | 3063657 |
| 17 | -5478698 |
| 18 | 9648360 |
| 19 | -16752522 |
| 20 | 28708214 |
| 21 | -48599047 |
| 22 | 81338660 |
| 23 | -134687856 |
| 24 | 220802690 |
| 25 | -358574468 |
| 26 | 577143752 |
| 27 | -921144678 |
| 28 | 1458485460 |