A099686 Consider the family of multigraphs enriched by the species of quaternary sets. Sequence gives number of those multigraphs with 4n loops and arcs.

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

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: A012730 A012734 A363699 * A066152 A112862 A094484

Adjacent sequences: A099683 A099684 A099685 * A099687 A099688 A099689

Keyword

nonn

Author

N. J. A. Sloane, Oct 26 2004

Status

approved