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 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 4 |
| 5 | 16 |
| 6 | 144 |
| 7 | 7056 |
| 8 | 13046544 |
| 9 | 42600214749456 |
| 10 | 453694852221644777216198544 |
| 11 | 51459754733114686962148583539748993964925660496781456 |