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 | 7 |
| 4 | 13 |
| 5 | 17 |
| 6 | 31 |
| 7 | 73 |
| 8 | 127 |
| 9 | 257 |
| 10 | 307 |
| 11 | 757 |
| 12 | 1093 |
| 13 | 1723 |
| 14 | 2801 |
| 15 | 3541 |
| 16 | 5113 |
| 17 | 8011 |
| 18 | 8191 |
| 19 | 10303 |
| 20 | 17293 |
| 21 | 19531 |
| 22 | 28057 |
| 23 | 30103 |
| 24 | 30941 |
| 25 | 65537 |
| 26 | 86143 |
| 27 | 88741 |
| 28 | 131071 |
| 29 | 147073 |