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 | 7 |
| 3 | 31 |
| 4 | 271 |
| 5 | 4591 |
| 6 | 151471 |
| 7 | 9845551 |
| 8 | 326409519151 |
| 9 | 16455349947998422816223361143099916435126171767057238357700938736968751 |