%I A007831
%S A007831 1,0,1,1,16,61,806,6329,89272,1082281,17596162,284074165,
%T A007831 5407229972,107539072733,2380274168806,55833426732529,1418006883852784,
%U A007831 38195636967960913,1097755724834189834,33345176998235584301
%N A007831 Number of edge-labeled series-reduced trees with n nodes.
%H A007831 P. J. Cameron, <a href="http://www.combinatorics.org/Volume_2/volume2.html#R4">
               Counting two-graphs related to trees</a>, Elec. J. Combin., Vol. 
               2, #R4.
%H A007831 <a href="Sindx_Tra.html#trees">Index entries for sequences related to 
               trees</a>
%Y A007831 Sequence in context: A031190 A043229 A044009 this_sequence A118254 A066391 
               A022289
%Y A007831 Adjacent sequences: A007828 A007829 A007830 this_sequence A007832 A007833 
               A007834
%K A007831 nonn
%O A007831 1,5
%A A007831 Peter Cameron [ P.J.Cameron(AT)qmw.ac.uk ]