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 | 19 |
| 2 | 157 |
| 3 | 1531 |
| 4 | 4941253 |
| 5 | 100663291 |
| 6 | 2324522929 |
| 7 | 774660240526566167037696179607987213236023100283073 |