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%I #4 Dec 22 2020 18:26:08
%S 1,3,26,339,6241,146261,4192048,141800728,5532432894,244530744314,
%T 12076710992326,659091388208810,39390323152318533,2558571976136883890,
%U 179469998189344217166,13520418589045722826274,1088748555389998857776521,93324804498600668393385498
%N 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.
%C See A339297 for additional details.
%o (PARI) \\ See A339297 for R(n, k).
%o seq(n)={sum(k=1, n, R(n, k)*sum(r=k, n, binomial(r, k)*(-1)^(r-k)) )}
%Y Row sums of A339297.
%Y Cf. A339229.
%K nonn
%O 1,2
%A _Andrew Howroyd_, Dec 22 2020
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