A098625 Consider the family of multigraphs enriched by the species of derangements. Sequence gives number of those multigraphs with n loops and edges.

1, 0, 2, 4, 39, 228, 2400, 23616, 307692, 4197408, 67658769, 1174316570, 22916090131, 482946085932

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..13.

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

Crossrefs

Sequence in context: A009834 A106127 A018992 * A057777 A139735 A184952

Adjacent sequences: A098622 A098623 A098624 * A098626 A098627 A098628

Keyword

nonn

Author

N. J. A. Sloane, Oct 26 2004

Status

approved