Number of constant paths through the subset array of {1,2,...,n}; see Comments.

A208650

Number of constant paths through the subset array of {1,2,...,n}; see Comments.

Terms

    a(0) =1a(1) =2a(2) =6a(3) =36a(4) =480a(5) =15000a(6) =1134000a(7) =211768200a(8) =99131719680

External references