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 | 2 |
| 2 | 28 |
| 3 | 2024 |
| 4 | 635376 |
| 5 | 820384032 |
| 6 | 4281625192384 |
| 7 | 89850821311025280 |
| 8 | 7571365534761592422144 |
| 9 | 2561263066959640762657702400 |
| 10 | 3477982739629565890806006777904128 |