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 | 8 |
| 3 | 20 |
| 4 | 92 |
| 5 | 2744 |
| 6 | 950998216 |
| 7 | 2076795963681989019155896 |
| 8 | 21651217007530946175606768762255421159692845640522169779616 |