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A339298 Number of oriented series-parallel networks with n integer valued elements spanning an initial interval of positive integers and without multiple unit elements in parallel. 1
1, 3, 26, 339, 6241, 146261, 4192048, 141800728, 5532432894, 244530744314, 12076710992326, 659091388208810, 39390323152318533, 2558571976136883890, 179469998189344217166, 13520418589045722826274, 1088748555389998857776521, 93324804498600668393385498 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

See A339297 for additional details.

LINKS

Table of n, a(n) for n=1..18.

PROG

(PARI) \\ See A339297 for R(n, k).

seq(n)={sum(k=1, n, R(n, k)*sum(r=k, n, binomial(r, k)*(-1)^(r-k)) )}

CROSSREFS

Row sums of A339297.

Cf. A339229.

Sequence in context: A109074 A227020 A119293 * A328269 A136046 A206404

Adjacent sequences:  A339295 A339296 A339297 * A339299 A339300 A339301

KEYWORD

nonn

AUTHOR

Andrew Howroyd, Dec 22 2020

STATUS

approved

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Last modified January 16 19:48 EST 2022. Contains 350376 sequences. (Running on oeis4.)