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 | 2 |
| 2 | 3 |
| 3 | 5 |
| 4 | 7 |
| 5 | 11 |
| 6 | 31 |
| 7 | 71 |
| 8 | 511 |
| 9 | 2591 |
| 10 | 131071 |
| 11 | 3359231 |
| 12 | 167247871 |
| 13 | 8589934591 |