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 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 44 |
| 4 | 504 |
| 5 | 12128 |
| 6 | 810616 |
| 7 | 134312136 |
| 8 | 65039805696 |
| 9 | 77906886854938 |