A006350 - OEIS

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A006350

Related to series-parallel networks.
(Formerly M4388)

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.