Number of labeled directed multigraphs (without loops) with n arcs and no vertex of degree 0.
A121137
Number of labeled directed multigraphs (without loops) with n arcs and no vertex of degree 0.
Terms
- a(0) =1a(1) =2a(2) =27a(3) =572a(4) =16787a(5) =631362a(6) =28980861a(7) =1570956872a(8) =98212870233
External references
- oeis: A121137