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 | 228 |
| 3 | -944 |
| 4 | 114 |
| 5 | 13920 |
| 6 | -40824 |
| 7 | -35568 |
| 8 | 314943 |
| 9 | -32016 |
| 10 | -1256028 |
| 11 | -1702560 |
| 12 | 7990622 |
| 13 | 15859872 |
| 14 | -44241384 |
| 15 | -69900560 |
| 16 | 66340899 |
| 17 | 389812176 |
| 18 | 368445848 |
| 19 | -1602538800 |
| 20 | -2603154606 |
| 21 | 114976000 |
| 22 | 12365751792 |