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 | 0 |
| 2 | -14 |
| 3 | -48 |
| 4 | 198 |
| 5 | 2080 |
| 6 | 1780 |
| 7 | -57120 |
| 8 | -270522 |
| 9 | 796992 |
| 10 | 11771676 |
| 11 | 18981600 |
| 12 | -314843364 |
| 13 | -1841666112 |
| 14 | 3400749352 |
| 15 | 74960197312 |
| 16 | 175979793990 |
| 17 | -1853840247168 |
| 18 | -13190663057780 |
| 19 | 11783856595680 |
| 20 | 496784970525748 |
| 21 | 1536657455021760 |
| 22 | -11053154849810472 |
| 23 | -96149956882617792 |
| 24 | 4480143410034972 |