%I M4388 #8 Mar 30 2012 16:44:57
%S 0,1,7,27,101,337,1151,3843,12965,43773,148529,505605,1727771,5920823,
%T 20345445,70073901,241849929,836230109,2896104951,10044664507,
%U 34884102385,121293088909,422196245641,1471030361069,5130057477187,17905427995239
%N Related to series-parallel networks.
%D Z. A. Lomnicki, Two-terminal series-parallel networks, Adv. Appl. Prob., 4 (1972), 109-150.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%F Sum_{k=1..n-1} A000084(k)*A006349(n-k), n >= 2.
%Y Cf. A000084, A006349, A058351, A058352, A058353, A000669.
%K nonn,easy
%O 1,3
%A _N. J. A. Sloane_.