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A099692
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Consider the family of multigraphs enriched by the species of directed sets. Sequence gives number of those multigraphs with n edges.
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0
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1, 1, 4, 23, 220, 3016, 55011, 1265824, 35496711, 1183686987, 46072834777
(list; graph; refs; listen; history; internal format)
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