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A058494
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Total number of interior nodes in all essentially parallel series-parallel networks with n unlabeled edges, multiple edges allowed.
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2
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OFFSET
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0,4
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REFERENCES
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J. W. Moon, Some enumerative results on series-parallel networks, Annals Discrete Math., 33 (1987), 199-226 (the sequence I_p(n)*p_pi).
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LINKS
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FORMULA
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Reference gives g.f.
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CROSSREFS
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KEYWORD
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nonn,nice,more
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AUTHOR
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STATUS
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approved
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