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 | -24 |
| 2 | 264 |
| 3 | -1760 |
| 4 | 7944 |
| 5 | -25872 |
| 6 | 64416 |
| 7 | -133056 |
| 8 | 253704 |
| 9 | -472760 |
| 10 | 825264 |
| 11 | -1297056 |
| 12 | 1938336 |
| 13 | -2963664 |
| 14 | 4437312 |
| 15 | -6091584 |
| 16 | 8118024 |
| 17 | -11368368 |
| 18 | 15653352 |
| 19 | -19822176 |
| 20 | 24832944 |
| 21 | -32826112 |
| 22 | 42517728 |
| 23 | -51425088 |
| 24 | 61903776 |
| 25 | -78146664 |
| 26 | 98021616 |
| 27 | -115331264 |
| 28 | 133522752 |