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 | 173 |
| 5 | 699053 |
| 6 | 3301173438094347399730997933 |
| 7 | 15589350798196297794172638215640352209663280458413 |