%N Total number of multiple edges in all essentially parallel series-parallel networks with n unlabeled edges, multiple edges allowed.
%D J. W. Moon, Some enumerative results on series-parallel networks, Annals Discrete Math., 33 (1987), 199-226 (the sequence M_p(n)*p_pi).
%H <a href="/index/Mo#Moon87">Index entries for sequences mentioned in Moon (1987)</a>
%F Reference gives g.f.
%A _N. J. A. Sloane_, Dec 20 2000