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 | 1 |
| 2 | 6 |
| 3 | 69 |
| 4 | 1144 |
| 5 | 25045 |
| 6 | 708336 |
| 7 | 24564211 |
| 8 | 1020980640 |
| 9 | 49909891257 |