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 | 0 |
| 3 | 44 |
| 4 | 330 |
| 5 | 0 |
| 6 | 0 |
| 7 | 4224 |
| 8 | 7524 |
| 9 | 0 |
| 10 | 0 |
| 11 | 30600 |
| 12 | 23276 |
| 13 | 0 |
| 14 | 0 |
| 15 | 130944 |