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 | 47 |
| 3 | 347 |
| 4 | 10139 |
| 5 | 396527668833598369303619003 |
| 6 | 1624796301562061610805093487 |
| 7 | 2637188343637273091841153207596203623407 |