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 | 4 |
| 2 | 52 |
| 3 | 1060 |
| 4 | 21301 |
| 5 | 427873 |
| 6 | 8594032 |
| 7 | 172615738 |
| 8 | 3467079760 |
| 9 | 69638158519 |