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 | 9 |
| 1 | 65 |
| 2 | 4097 |
| 3 | 16777217 |
| 4 | 281474976710657 |
| 5 | 79228162514264337593543950337 |
| 6 | 6277101735386680763835789423207666416102355444464034512897 |