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 | 8 |
| 3 | 900 |
| 4 | 359424 |
| 5 | 370828800 |
| 6 | 820150272000 |
| 7 | 3435918974208000 |
| 8 | 24957654229057536000 |
| 9 | 294060698786444083200000 |
| 10 | 5334667831784096818790400000 |
| 11 | 42889554205720574193041408000000 |