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 | 31 |
| 4 | 709 |
| 5 | 9737333 |
| 6 | 3657500101 |
| 7 | 2586559730396077 |
| 8 | 4123221751654370051 |
| 9 | 28785866289100396890228041 |