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 | 3 |
| 1 | 4 |
| 2 | 14 |
| 3 | 1120 |
| 4 | 1129856000 |
| 5 | 1429646991180169216000000000 |
| 6 | 2922003679260403682236915960536301659966658013592289280000000000000000000000000000 |