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 | 4 |
| 3 | 64 |
| 4 | 34120 |
| 5 | 15748194 |
| 6 | 7568305274 |
| 7 | 4203938567056 |