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 | 4 |
| 4 | 28 |
| 5 | 28 |
| 6 | 170926 |
| 7 | 170926 |
| 8 | 931371868 |
| 9 | 15538734736 |
| 10 | 89468493268 |
| 11 | 6009549731752 |
| 12 | 89984938946056 |
| 13 | 43000687652274618 |