Certain subgraphs of a directed graph (inverse binomial transform of A005321).

A005014

Certain subgraphs of a directed graph (inverse binomial transform of A005321).

Terms

    a(0) =1a(1) =1a(2) =7a(3) =97a(4) =2911a(5) =180481a(6) =22740607a(7) =5776114177

External references