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) |
|---|---|
| 0 | 3 |
| 1 | 7 |
| 2 | 11 |
| 3 | 31 |
| 4 | 79 |
| 5 | 191 |
| 6 | 223 |
| 7 | 8191 |
| 8 | 73727 |
| 9 | 81919 |
| 10 | 738197503 |
| 11 | 51539607551 |
| 12 | 3232601036663613174009984612954335460652964980182760163363015849805536730581466940964863 |