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A099714
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Consider the family of multigraphs enriched by the species of arborescences. Sequence gives number of those multigraphs with n loops and arcs.
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1, 2, 17, 258, 5771, 174528, 6770119, 324895980, 18781627193, 1281239711000, 101465766593553, 9204346831406488
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