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 | 2 |
| 2 | 6 |
| 3 | 32 |
| 4 | 370 |
| 5 | 11292 |
| 6 | 1066044 |
| 7 | 347326352 |
| 8 | 419172756930 |
| 9 | 1955230985997140 |