A058488 - OEIS

%I #10 May 19 2021 00:11:24

%S 0,0,1,4,10,30,78,217

%N Total number of interior nodes in all essentially parallel series-parallel networks with n unlabeled edges, multiple edges not allowed.

%H J. W. Moon, <a href="https://doi.org/10.1016/S0304-0208(08)73057-3">Some enumerative results on series-parallel networks</a>, Annals Discrete Math., 33 (1987), 199-226 (the sequence I_q(n)*q_pi Table 2).

%H <a href="/index/Mo#Moon87">Index entries for sequences mentioned in Moon (1987)</a>

%F Reference gives g.f.

%Y Cf. A058494, A058495.

%K nonn,nice,more

%O 0,4

%A _N. J. A. Sloane_, Dec 20 2000