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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1560 |
| 7 | 0 |
| 8 | 34000 |
| 9 | 175104 |
| 10 | 0 |
| 11 | 22417824 |
| 12 | 313235960 |
| 13 | 0 |
| 14 | 83574857328 |
| 15 | 1729671003296 |