A099681 Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n loops and edges.

1, 2, 72, 12630, 6608296, 7926336602, 18527530189240

Offset

0,2

References

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

Links

Table of n, a(n) for n=0..6.

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

Crossrefs

Sequence in context: A123072 A351764 A317346 * A362544 A062082 A067689

Adjacent sequences: A099678 A099679 A099680 * A099682 A099683 A099684

Keyword

nonn

Author

N. J. A. Sloane, Oct 26 2004

Status

approved