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 | -1 |
| 3 | -7 |
| 4 | -60 |
| 5 | -1210 |
| 6 | -34020 |
| 7 | -607332 |
| 8 | -30448441 |
| 9 | -1093612784 |
| 10 | -55400732937 |
| 11 | -2471079070511 |
| 12 | -197500419383964 |