%I A118025
%S A118025 1,1,2,6,28,216,2864,66656,2760896,205824384,27886535424,6924055315968,
%T A118025 3173107641551872,2700294145104025600,4289542333320782426112,
%U A118025 12777557344991526923034624,71652489091220599890081005568
%N A118025 Column 0 of triangle A118024; also, column 0 of the matrix square of 
               A118024 equals this sequence shifted 1 place left.
%F A118025 a(n) = Sum_{k=0..n-1} 2^(k*(n-1-k))*a(k)*a(n-1-k) for n>0 with a(0)=1.
%Y A118025 Cf. A118024.
%Y A118025 Sequence in context: A125812 A093657 A006117 this_sequence A119966 A002047 
               A126340
%Y A118025 Adjacent sequences: A118022 A118023 A118024 this_sequence A118026 A118027 
               A118028
%K A118025 nonn
%O A118025 0,3
%A A118025 Paul D. Hanna (pauldhanna(AT)juno.com), Apr 10 2006