A098625 Consider the family of multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n loops and edges.

1, 0, 2, 4, 39, 228, 2400, 23616, 307692, 4197408, 67658769, 1174316570, 22916090131, 482946085932

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]