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 | 7 |
| 2 | 19 |
| 3 | 81349 |
| 4 | 3335149 |
| 5 | 196773559 |
| 6 | 13970922409 |
| 7 | 150983758430839 |