%I A006771
%S A006771 1,2,4,8,18,46,128,372,1174,3820,13170,46714,172490,652758,
%T A006771 2547196,10156810,41495158,172810254,734132414,3171713642,
%U A006771 13933910250,62121022408,280907384318,1286617710114,5964793344934
%N A006771 Exponential self-convolution of numbers of trees on n nodes.
%Y A006771 Cf. A000055.
%Y A006771 Sequence in context: A006786 A125809 A000117 this_sequence A113989 A126757 
               A034766
%Y A006771 Adjacent sequences: A006768 A006769 A006770 this_sequence A006772 A006773 
               A006774
%K A006771 nonn
%O A006771 0,2
%A A006771 N. J. A. Sloane (njas(AT)research.att.com).