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 | 3 |
| 3 | 29 |
| 4 | 940 |
| 5 | 104286 |
| 6 | 40050850 |
| 7 | 53640013886 |
| 8 | 251995529844792 |