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A099681
Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n loops and edges.
0
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
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
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 26 2004
STATUS
approved