Consider the family of multigraphs enriched by the species of trees. Sequence gives number of those multigraphs with n arcs.

A099719

Consider the family of multigraphs enriched by the species of trees. Sequence gives number of those multigraphs with n arcs.

Terms

    a(0) =1a(1) =1a(2) =7a(3) =89a(4) =1720a(5) =45887a(6) =1595192a(7) =69438623a(8) =3675895762a(9) =231400961167

External references