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) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 6 |
| 6 | 0 |
| 7 | 96 |
| 8 | 272 |
| 9 | 1408 |
| 10 | 61622 |
| 11 | 33736 |
| 12 | 356606 |
| 13 | 86520774 |
| 14 | 192570133 |
| 15 | 1560696233 |