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 | 72 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 600 |
| 5 | 726 |
| 6 | -1440 |
| 7 | 0 |
| 8 | 7056 |
| 9 | 8100 |
| 10 | -13824 |
| 11 | -20808 |
| 12 | 94176 |
| 13 | 119130 |
| 14 | -196800 |
| 15 | -291942 |
| 16 | 917664 |
| 17 | 1986924 |
| 18 | -2389248 |
| 19 | -5092500 |
| 20 | 10788960 |
| 21 | 26041338 |
| 22 | -21643104 |
| 23 | -81270876 |
| 24 | 111771360 |
| 25 | 369058596 |
| 26 | -215519232 |
| 27 | -1109316384 |