%I A001574 M2029 N0801
%S A001574 0,2,12,60,292,1438,7180,36566
%N A001574 Colored series-parallel networks.
%D A001574 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001574 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001574 J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 
               159.
%Y A001574 Sequence in context: A062478 A005430 A094434 this_sequence A074445 A038154 
               A061834
%Y A001574 Adjacent sequences: A001571 A001572 A001573 this_sequence A001575 A001576 
               A001577
%K A001574 nonn
%O A001574 1,2
%A A001574 N. J. A. Sloane (njas(AT)research.att.com).