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 | 51 |
| 2 | 2403 |
| 3 | 5764803 |
| 4 | 33232930569603 |
| 5 | 1104427674243920646305299203 |