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 | -3 |
| 2 | 8 |
| 3 | -23 |
| 4 | 70 |
| 5 | -218 |
| 6 | 688 |
| 7 | -2195 |
| 8 | 7062 |
| 9 | -22866 |
| 10 | 74416 |
| 11 | -243206 |
| 12 | 797660 |
| 13 | -2624004 |
| 14 | 8654304 |
| 15 | -28607171 |
| 16 | 94748774 |
| 17 | -314361682 |
| 18 | 1044625200 |
| 19 | -3476135186 |
| 20 | 11581870900 |
| 21 | -38632753228 |
| 22 | 128998096032 |
| 23 | -431144781486 |
| 24 | 1442252806012 |