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Search: id:A058386
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| A058386 |
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Essentially series series-parallel networks with n unlabeled edges, multiple edges not allowed. |
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+0
3
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| 0, 0, 1, 1, 2, 4, 9, 20, 47, 112, 274, 678, 1709, 4346, 11176, 28966, 75656, 198814, 525496, 1395758, 3723986, 9975314, 26817655, 72332320, 195679137, 530814386, 1443556739, 3934880554, 10748839215, 29420919456, 80678144437, 221618678694
(list; graph; listen)
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OFFSET
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0,5
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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 r_n).
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LINKS
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Index entries for sequences mentioned in Moon (1987)
S. R. Finch, Series-parallel networks
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FORMULA
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G.f. satisfies A(x) = A058385(x)-x+x^2.
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CROSSREFS
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Cf. A058379, A058385, A058387.
Sequence in context: A003018 A035084 A058385 this_sequence A095980 A036619 A036620
Adjacent sequences: A058383 A058384 A058385 this_sequence A058387 A058388 A058389
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KEYWORD
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nonn,easy,nice
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AUTHOR
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N. J. A. Sloane (njas(AT)research.att.com), Dec 20 2000
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