%I #7 Mar 30 2012 16:48:55
%S 0,1,3,7,17,41,107,287,809,2341,6965,21101,65031,202939,640441,
%T 2039509,6546861,21158437,68791923,224839127,738316629,2434622357,
%U 8058616301,26765349429,89173526191,297942766331,998072479961,3351459203873
%N Partial sums of A000084.
%D Z. A. Lomnicki, Two-terminal series-parallel networks, Adv. Appl. Prob., 4 (1972), 109-150.
%H Sameen Ahmed KHAN, <a href="/A153588/a153588.nb">Mathematica notebook for A153588 and A058351</a>
%Y Cf. A000084, A006349, A006350, A058352, A058353, A000669.
%K nonn
%O 0,3
%A _N. J. A. Sloane_, Dec 16 2000