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 | 4 |
| 2 | 9 |
| 3 | 289 |
| 4 | 332929 |
| 5 | 8867310888979 |
| 6 | 78629202401805543263662441 |
| 7 | 24730205881376410453776804740727484868533062121664161 |