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 | 2 |
| 1 | 5 |
| 2 | 17 |
| 3 | 97 |
| 4 | 257 |
| 5 | 3457 |
| 6 | 12289 |
| 7 | 40961 |
| 8 | 65537 |
| 9 | 786433 |
| 10 | 5308417 |
| 11 | 14155777 |
| 12 | 104857601 |
| 13 | 167772161 |
| 14 | 1811939329 |
| 15 | 3221225473 |
| 16 | 24159191041 |
| 17 | 77309411329 |
| 18 | 206158430209 |
| 19 | 2061584302081 |
| 20 | 2748779069441 |
| 21 | 6597069766657 |
| 22 | 39582418599937 |