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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 (list; graph; refs; listen; history; text; internal format)
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: A246486 A123072 A317346 * A062082 A067689 A308941

Adjacent sequences:  A099678 A099679 A099680 * A099682 A099683 A099684

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2004

STATUS

approved

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Last modified June 19 09:09 EDT 2021. Contains 345126 sequences. (Running on oeis4.)