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A098344 Consider the family of multigraphs enriched by the species of binary arborescences. Sequence gives number of those multigraphs with n loops and arcs. 0
1, 2, 21, 378, 9819, 338978, 14802427, 790660090, 50405704473, 3763429394138, 324142520562853, 31809195929392082 (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..11.

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

CROSSREFS

Sequence in context: A241247 A177234 A099710 * A228384 A216281 A263625

Adjacent sequences:  A098341 A098342 A098343 * A098345 A098346 A098347

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2004

STATUS

approved

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Last modified September 19 23:31 EDT 2019. Contains 327207 sequences. (Running on oeis4.)