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A006350
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Related to series-parallel networks.
(Formerly M4388)
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4
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0, 1, 7, 27, 101, 337, 1151, 3843, 12965, 43773, 148529, 505605, 1727771, 5920823, 20345445, 70073901, 241849929, 836230109, 2896104951, 10044664507, 34884102385, 121293088909, 422196245641, 1471030361069, 5130057477187, 17905427995239
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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REFERENCES
| Z. A. Lomnicki, Two-terminal series-parallel networks, Adv. Appl. Prob., 4 (1972), 109-150.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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FORMULA
| Sum_{k=1..n-1} A000084(k)*A006349(n-k), n >= 2.
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CROSSREFS
| Cf. A000084, A006349, A058351, A058352, A058353, A000669.
Sequence in context: A059823 A059769 A135914 * A054485 A090856 A055917
Adjacent sequences: A006347 A006348 A006349 * A006351 A006352 A006353
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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