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 | 65535 |
| 2 | 4251920575 |
| 3 | 264152863210065 |
| 4 | 15574913193760097649 |
| 5 | 884176137127765554601535 |