A360863 Number of unlabeled connected multigraphs with n edges and degree >= 3 at each node, loops allowed.

0, 1, 3, 5, 13, 36, 99, 301, 980, 3345, 12036, 45399, 178420, 729149

Offset

1,3

Links

Table of n, a(n) for n=1..14.

Formula

Inverse Euler transform of A360865.

Crossrefs

Row sums of A360862.

Cf. A360864 (by circuit rank), A360865 (not necessarily connected).

Sequence in context: A324783 A032009 A032027 * A005383 A306826 A175257

Adjacent sequences: A360860 A360861 A360862 * A360864 A360865 A360866

Keyword

nonn,more

Author

Andrew Howroyd, Feb 24 2023

Status

approved