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A006349 Related to series-parallel networks.
(Formerly M3834)
4
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; text; internal format)
OFFSET
1,2
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).
LINKS
FORMULA
A058352(n) + n*A000084(n).
CROSSREFS
Sequence in context: A218926 A360798 A113835 * A322203 A052899 A147200
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified February 24 22:04 EST 2024. Contains 370307 sequences. (Running on oeis4.)