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 | -1 |
| 2 | 4 |
| 3 | -46 |
| 4 | 1024 |
| 5 | -36976 |
| 6 | 1965664 |
| 7 | -144361456 |
| 8 | 13997185024 |
| 9 | -1731678144256 |
| 10 | 266182076161024 |
| 11 | -49763143319190016 |
| 12 | 11118629668610842624 |
| 13 | -2925890822304510631936 |
| 14 | 895658946905031792553984 |