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A006350 Related to series-parallel networks.
(Formerly M4388)
4
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; text; internal format)
OFFSET

1,3

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..26.

FORMULA

Sum_{k=1..n-1} A000084(k)*A006349(n-k), n >= 2.

CROSSREFS

Cf. A000084, A006349, A058351, A058352, A058353, A000669.

Sequence in context: A213588 A282642 A185080 * A054485 A090856 A055917

Adjacent sequences:  A006347 A006348 A006349 * A006351 A006352 A006353

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified February 23 00:03 EST 2018. Contains 299472 sequences. (Running on oeis4.)