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A098630 Consider the family of multigraphs enriched by the species of parts. Sequence gives number of those multigraphs with n loops and arcs 0
1, 4, 60, 1624, 66240, 3711200, 269670208, 24435113216, 2682916389632, 349223324753408, 52965538033020928 (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..10.

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

FORMULA

a(n) = 2^n*Bell(2*n). - Vladeta Jovovic, Aug 22 2006

CROSSREFS

Sequence in context: A013484 A013485 A324959 * A330069 A211309 A013502

Adjacent sequences:  A098627 A098628 A098629 * A098631 A098632 A098633

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Oct 26 2004

STATUS

approved

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Last modified April 3 15:51 EDT 2020. Contains 333197 sequences. (Running on oeis4.)