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A099686 Consider the family of multigraphs enriched by the species of quaternary sets. Sequence gives number of those multigraphs with 4n loops and arcs. 0
1, 2, 457, 941987, 8153027092, 208426400639147 (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..5.

CROSSREFS

Sequence in context: A159513 A012730 A012734 * A066152 A112862 A094484

Adjacent sequences:  A099683 A099684 A099685 * A099687 A099688 A099689

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2004

STATUS

approved

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Last modified December 2 23:29 EST 2016. Contains 278694 sequences.