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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

Table of n, a(n) for n=1..25.

FORMULA

A058352(n) + n*A000084(n).

CROSSREFS

Cf. A000084, A006350, A058351, A058352, A058353, A000669.

Sequence in context: A115785 A218926 A113835 * A052899 A147200 A147396

Adjacent sequences:  A006346 A006347 A006348 * A006350 A006351 A006352

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 18 05:17 EDT 2018. Contains 316304 sequences. (Running on oeis4.)