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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 0 |
| 6 | 0 |
| 7 | 769230 |
| 8 | 476190 |
| 9 | 2941176470588235 |
| 10 | 18 |
| 11 | 11235955056179775280898876404494382022471910 |
| 12 | 4 |