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 | 2 |
| 4 | 13 |
| 5 | 867 |
| 6 | 12001543 |
| 7 | 4909644519038939 |
| 8 | 2976533007674072187623474816337374 |
| 9 | 5305128832761583696023807632374530398637482018663107882637653612424699 |