Number of paths through the subset array whose trace is a permutation of (1,2,...,n); see Comments.

A208651

Number of paths through the subset array whose trace is a permutation of (1,2,...,n); see Comments.

Terms

    a(0) =1a(1) =2a(2) =12a(3) =216a(4) =11520a(5) =1800000a(6) =816480000

External references