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 | 2 |
| 2 | 5 |
| 3 | 20 |
| 4 | 104 |
| 5 | 936 |
| 6 | 13842 |
| 7 | 188424 |
| 8 | 3249576 |
| 9 | 81239400 |
| 10 | 2388809736 |
| 11 | 59720243400 |