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A099715
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Consider the family of multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n arcs.
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1, 1, 8, 113, 2374, 67927, 2508632, 115219211, 6402538044, 42137859873, 32293353537408, 2842256451820073
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