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) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 30 |
| 4 | 564 |
| 5 | 21224 |
| 6 | 1537496 |
| 7 | 225780260 |
| 8 | 68862687289 |
| 9 | 42474080549252 |
| 10 | 53316494203981492 |