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 | 0 |
| 2 | -4 |
| 3 | 24 |
| 4 | -324 |
| 5 | -15164 |
| 6 | -1453072 |
| 7 | -161765904 |
| 8 | -37905894000 |
| 9 | -1376219654680 |
| 10 | -718058901423168 |
| 11 | -163742479201610036 |