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 | -32 |
| 2 | 480 |
| 3 | -4480 |
| 4 | 29152 |
| 5 | -140736 |
| 6 | 525952 |
| 7 | -1580800 |
| 8 | 3994080 |
| 9 | -8945824 |
| 10 | 18626112 |
| 11 | -36714624 |
| 12 | 67978880 |
| 13 | -118156480 |
| 14 | 197120256 |
| 15 | -321692928 |
| 16 | 509145568 |
| 17 | -772845120 |
| 18 | 1143441760 |
| 19 | -1681379200 |
| 20 | 2428524096 |
| 21 | -3392205824 |
| 22 | 4658843520 |
| 23 | -6411152640 |
| 24 | 8705492608 |
| 25 | -11488092896 |