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 | 464 |
| 3 | -3968 |
| 4 | 21576 |
| 5 | -72384 |
| 6 | 109120 |
| 7 | 215296 |
| 8 | -1542684 |
| 9 | 3135712 |
| 10 | 217248 |
| 11 | -14153856 |
| 12 | 25215616 |
| 13 | 2704192 |
| 14 | -60182656 |
| 15 | 43083520 |
| 16 | 52111434 |
| 17 | 50631680 |
| 18 | -328746320 |
| 19 | -68928128 |
| 20 | 1172526144 |
| 21 | -825260672 |
| 22 | -1202344640 |