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A099687 Consider the family of multigraphs enriched by the species of quaternary sets. Sequence gives number of those multigraphs with 4n arcs. 0
1, 1, 211, 395671, 3199595881, 7721895343841 (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..5.

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

CROSSREFS

Sequence in context: A013547 A181002 A323426 * A133651 A093807 A088642

Adjacent sequences:  A099684 A099685 A099686 * A099688 A099689 A099690

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2004

STATUS

approved

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Last modified January 25 11:49 EST 2022. Contains 350567 sequences. (Running on oeis4.)