A060079 Duplicate of A052502.
1, 2, 40, 2240, 246400, 44844800, 12197785600, 4635158528000, 2345390215168000
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.