A098635 Consider the family of multigraphs enriched by the species of even sets. Sequence gives number of those multigraphs with 2n arcs.

1, 1, 19, 1111, 141289, 32283361, 11841596779, 6461678187511, 4966364015391889

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..8.

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

Crossrefs

Sequence in context: A195214 A213864 A217827 * A217828 A217829 A063442

Adjacent sequences: A098632 A098633 A098634 * A098636 A098637 A098638

Keyword

nonn

Author

N. J. A. Sloane, Oct 26 2004

Status

approved