A012390 Duplicate of A009613.
2, 16, 392, 21376, 1875872, 227105536, 35750690432, 7110343684096
Offset: 0
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.