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A099718
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Consider the family of multigraphs enriched by the species of trees. Sequence gives number of those multigraphs with n loops and edges.
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0
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1, 2, 15, 207, 4274, 120698, 4408714, 200482089, 11035845002, 719691942986, 54661283926338, 4768412660292713
(list; graph; refs; listen; history; internal format)
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