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 | 9 |
| 2 | 49 |
| 3 | 243 |
| 4 | 961 |
| 5 | 16129 |
| 6 | 67092481 |
| 7 | 17179607041 |
| 8 | 274876858369 |
| 9 | 4611686014132420609 |