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 | 8 |
| 3 | -16 |
| 4 | 96 |
| 5 | -320 |
| 6 | 1408 |
| 7 | -5376 |
| 8 | 22016 |
| 9 | -87040 |
| 10 | 350208 |
| 11 | -1396736 |
| 12 | 5595136 |
| 13 | -22364160 |
| 14 | 89489408 |
| 15 | -357892096 |
| 16 | 1431699456 |
| 17 | -5726535680 |
| 18 | 22906667008 |
| 19 | -91625619456 |
| 20 | 366504574976 |
| 21 | -1466014105600 |
| 22 | 5864064811008 |
| 23 | -23456242466816 |
| 24 | 93825003421696 |
| 25 | -375299946577920 |