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 | 48 |
| 3 | 34560 |
| 4 | 1393459200 |
| 5 | 5056584744960000 |
| 6 | 2422112183371431936000000 |
| 7 | 211155601241022491077587763200000000 |
| 8 | 4417964278440225627098723475313498521600000000000 |