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A360882
Number of unlabeled connected multigraphs with n edges, no cut-points and degree >= 3 at each node, loops allowed.
1
0, 1, 3, 5, 10, 21, 45, 114, 330, 1045, 3623, 13545, 53597, 223085, 969159
OFFSET
1,3
FORMULA
a(n) = A360871(n) + 1 for n > 1.
EXAMPLE
The a(3) = 3 multigraphs are:
- a single vertex with 3 loops;
- a triple edge;
- a single edge with a loop at each vertex.
CROSSREFS
Row sums of A360870.
Sequence in context: A284237 A241436 A018107 * A053709 A102772 A018005
KEYWORD
nonn,more
AUTHOR
Andrew Howroyd, Feb 27 2023
STATUS
approved