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) |
|---|---|
| 4 | 4818 |
| 5 | 4596 |
| 6 | 2454 |
| 7 | 816 |
| 8 | 246 |
| 9 | 60 |
| 10 | 0 |
| 11 | 0 |
| 12 | 9 |