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 | 3 |
| 2 | 5 |
| 3 | 13 |
| 4 | 85 |
| 5 | 3613 |
| 6 | 6526885 |
| 7 | 21300113901613 |
| 8 | 226847426110843688722000885 |
| 9 | 25729877366557343481074291996721923093306518970391613 |