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 | 1 |
| 2 | 6 |
| 3 | 91 |
| 4 | 597871 |
| 5 | 213122969971321411 |
| 6 | 9680343693975641657052402556458789711774336036960631 |