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 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 15 |
| 5 | 20 |
| 6 | 189 |
| 7 | 945 |
| 8 | 2125 |
| 9 | 6375 |
| 10 | 9261 |
| 11 | 46305 |
| 12 | 401625 |
| 13 | 19679625 |