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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 37 |
| 5 | 162 |
| 6 | 3068518062211324 |
| 7 | 1079268324684171943515797470873767312825026176345571319042096689270 |