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 | 13 |
| 3 | 17 |
| 4 | 257 |
| 5 | 313 |
| 6 | 641 |
| 7 | 769 |
| 8 | 2593 |
| 9 | 11489 |
| 10 | 19457 |
| 11 | 65537 |
| 12 | 163841 |
| 13 | 786433 |
| 14 | 1503233 |
| 15 | 1655809 |
| 16 | 7340033 |
| 17 | 14155777 |
| 18 | 18395137 |
| 19 | 23606273 |
| 20 | 29423041 |
| 21 | 39714817 |
| 22 | 75068993 |
| 23 | 167772161 |
| 24 | 2483027969 |
| 25 | 4643094529 |
| 26 | 6616514561 |
| 27 | 47148957697 |
| 28 | 241931001601 |
| 29 | 2748779069441 |