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 | 3 |
| 5 | 25 |
| 6 | 338 |
| 7 | 1760417 |
| 8 | 2719102918193 |
| 9 | 43888992061611808973481301345 |
| 10 | 501206842313618355048837897498360450999462416742984495192498 |