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) |
|---|---|
| 2 | 0 |
| 3 | 12 |
| 4 | 27636 |
| 5 | 12244717 |
| 6 | 5976334996 |
| 7 | 2692126890129 |