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 | 4 |
| 3 | 16 |
| 4 | 104 |
| 5 | 913 |
| 6 | 12217 |
| 7 | 237807 |
| 8 | 6843349 |
| 9 | 292253909 |
| 10 | 18485204565 |
| 11 | 1735778832010 |
| 12 | 242007116498916 |
| 13 | 50034244634072936 |
| 14 | 15365321608796091811 |