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 | 12 |
| 2 | -434 |
| 3 | -19080 |
| 4 | 523596 |
| 5 | 50396112 |
| 6 | -908439096 |
| 7 | -185674985568 |
| 8 | 1447444755600 |
| 9 | 875930470333632 |
| 10 | 2981558025372384 |
| 11 | -5027099422223924352 |
| 12 | -79281938992004709696 |
| 13 | 33916578324641082789120 |
| 14 | 1002723429481616382125184 |
| 15 | -262420270649216245344056832 |