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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 27 |
| 7 | 5837 |
| 8 | 2129410576 |
| 9 | 17850077316687753782569 |
| 10 | 2346851008195218976646246398770505953580095510848345967 |