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) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 90 |
| 4 | 353430 |
| 5 | 274407373885179150 |
| 6 | 2443417474326613595267894539584266773823049253134356678751627846400290750 |