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A098344
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Consider the family of multigraphs enriched by the species of binary arborescences. Sequence gives number of those multigraphs with n loops and arcs.
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1, 2, 21, 378, 9819, 338978, 14802427, 790660090, 50405704473, 3763429394138, 324142520562853, 31809195929392082
(list; graph; refs; listen; history; internal format)
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