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A099695
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Consider the family of multigraphs enriched by the species of directed sets. Sequence gives number of those multigraphs with n arcs.
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0
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1, 1, 8, 106, 2144, 59844, 2173450, 98648246, 5433864078, 355229741266, 27080154837658
(list; graph; refs; listen; history; internal format)
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