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A360882
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Number of unlabeled connected multigraphs with n edges, no cut-points and degree >= 3 at each node, loops allowed.
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1
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0, 1, 3, 5, 10, 21, 45, 114, 330, 1045, 3623, 13545, 53597, 223085, 969159
(list;
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listen;
history;
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internal format)
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OFFSET
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1,3
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LINKS
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FORMULA
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EXAMPLE
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The a(3) = 3 multigraphs are:
- a single vertex with 3 loops;
- a triple edge;
- a single edge with a loop at each vertex.
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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