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A098639
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Consider the family of multigraphs enriched by the species of odd sets. Sequence gives number of those multigraphs with n arcs.
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1, 1, 6, 69, 1230, 30663, 1005692, 41571127, 2099861244, 126607647073, 8945129371976, 729628409684925
(list; graph; refs; listen; history; internal format)
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