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A058494 Total number of interior nodes in all essentially parallel series-parallel networks with n unlabeled edges, multiple edges allowed. 0
0, 0, 1, 6, 20, 74, 245, 845 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

REFERENCES

J. W. Moon, Some enumerative results on series-parallel networks, Annals Discrete Math., 33 (1987), 199-226 (the sequence I_p(n)*p_pi).

LINKS

Table of n, a(n) for n=0..7.

Index entries for sequences mentioned in Moon (1987)

FORMULA

Reference gives g.f.

CROSSREFS

Sequence in context: A028402 A092760 A240043 * A147979 A118265 A204271

Adjacent sequences:  A058491 A058492 A058493 * A058495 A058496 A058497

KEYWORD

nonn,easy,nice,more

AUTHOR

N. J. A. Sloane, Dec 20 2000

STATUS

approved

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Last modified March 26 04:32 EDT 2019. Contains 321481 sequences. (Running on oeis4.)