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 | 7 |
| 2 | 17 |
| 3 | 37 |
| 4 | 257 |
| 5 | 353 |
| 6 | 1297 |
| 7 | 1697 |
| 8 | 2753 |
| 9 | 18433 |
| 10 | 65537 |
| 11 | 80897 |
| 12 | 98801 |
| 13 | 145601 |
| 14 | 763649 |
| 15 | 3360769 |
| 16 | 4709377 |
| 17 | 13631489 |
| 18 | 50307329 |
| 19 | 376037377 |
| 20 | 2483027969 |
| 21 | 3191106049 |
| 22 | 4926056449 |
| 23 | 51808043009 |
| 24 | 152605556737 |
| 25 | 916326983681 |
| 26 | 1268357529601 |
| 27 | 6597069766657 |
| 28 | 40711978221569 |