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 | 13 |
| 3 | 97 |
| 4 | 193 |
| 5 | 769 |
| 6 | 12289 |
| 7 | 786433 |
| 8 | 3221225473 |
| 9 | 206158430209 |
| 10 | 6597069766657 |
| 11 | 221360928884514619393 |
| 12 | 2353913150770005286438421033702874906038383291674012942337 |