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) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 147 |
| 4 | 21612 |
| 5 | 467078547 |
| 6 | 218162369067631212 |
| 7 | 47594819277201331861096436836588947 |
| 8 | 2265266822029455509816214491130485582138030749246532017266850242568812 |