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 | 0 |
| 1 | 1 |
| 2 | 6 |
| 3 | 18 |
| 4 | 20 |
| 5 | -90 |
| 6 | -588 |
| 7 | -1708 |
| 8 | -1944 |
| 9 | 7110 |
| 10 | 47300 |
| 11 | 136092 |
| 12 | 156312 |
| 13 | -528164 |
| 14 | -3540600 |
| 15 | -10141080 |
| 16 | -11703344 |