Number of digraphs with labeled vertices and labeled arcs, with n arcs and with no vertex of indegree 0 or outdegree 0.
A121936
Number of digraphs with labeled vertices and labeled arcs, with n arcs and with no vertex of indegree 0 or outdegree 0.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =18a(4) =518a(5) =23610a(6) =1600982a(7) =150451098a(8) =18694217558
External references
- oeis: A121936