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A099693
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Consider the family of multigraphs enriched by the species of directed sets. Sequence gives number of those multigraphs with n loops and edges.
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0
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1, 2, 11, 89, 1063, 17099, 352700, 8987170, 275303298, 9930027149, 414883314611
(list; graph; refs; listen; history; internal format)
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