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A099680 Consider the family of multigraphs enriched by the species of ternary sets. Sequence gives number of those multigraphs with 3n edges. 0
1, 1, 21, 2689, 1162525, 1213162861, 2531581232565 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

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: A225686 A221779 A122801 * A352086 A184367 A114934

Adjacent sequences: A099677 A099678 A099679 * A099681 A099682 A099683

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2004

STATUS

approved

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Last modified February 8 23:03 EST 2023. Contains 360153 sequences. (Running on oeis4.)