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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
OFFSET
0,2
REFERENCES
G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004..
LINKS
G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004. [Cached copy, with permission]
CROSSREFS
Sequence in context: A012730 A012734 A363699 * A066152 A112862 A094484
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 26 2004
STATUS
approved