A099707 Consider the family of multigraphs enriched by the species of directed graphs. Sequence gives number of those multigraphs with n arcs.

1, 2, 40, 1632, 140128, 42396096, 71916221184, 569069398642688, 18501543711357418496, 2419851465592233142433792

Offset: 0

Author

N. J. A. Sloane, Oct 26 2004

Keywords

• nonn

References

• G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004.

Links

• G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004. [Cached copy, with permission]