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 | 17 |
| 3 | 257 |
| 4 | 641 |
| 5 | 65537 |
| 6 | 167772161 |
| 7 | 2748779069441 |
| 8 | 46179488366593 |
| 9 | 1328165573307087716353 |
| 10 | 188894659314785808547841 |