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A006349
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Related to series-parallel networks.
(Formerly M3834)
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4
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1, 5, 13, 45, 121, 413, 1261, 4221, 13801, 46365, 155497, 527613, 1792805, 6126293, 20986153, 72121853, 248396793, 857416949, 2964896877, 10269596445, 35622421561, 123728022269, 430254861945, 1497796774077, 5219231003621
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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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
| A058352(n) + n*A000084(n).
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CROSSREFS
| Cf. A000084, A006350, A058351, A058352, A058353, A000669.
Sequence in context: A183184 A115785 A113835 * A052899 A147200 A147396
Adjacent sequences: A006346 A006347 A006348 * A006350 A006351 A006352
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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