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 | 2 |
| 3 | 8 |
| 4 | 192 |
| 5 | 50752 |
| 6 | 64264704 |
| 7 | 2591115982336 |
| 8 | 458135084510273536 |
| 9 | 5255224440224669298917376 |