%I A141223
%S A141223 1,5,24,113,526,2430,11166,51105,233190,1061510,4822984,21879786,
%T A141223 99135076,448707992,2029215114,9170247393,41416383366,186957126702,
%U A141223 843575853984,3804927658878,17156636097156,77339426905812
%N A141223 Expansion of 1/(sqrt(1-4x)*(1-3xc(x))), c(x) the g.f. of A000108.
%C A141223 Binomial transform of A126932. Hankel transform is (-1)^n.
%F A141223 a(n)=sum{k=0..n, C(2n-k,n-k)*3^k}
%Y A141223 Sequence in context: A171310 A081104 A079028 this_sequence A140766 A026388 
               A057969
%Y A141223 Adjacent sequences: A141220 A141221 A141222 this_sequence A141224 A141225 
               A141226
%K A141223 easy,nonn
%O A141223 0,2
%A A141223 Paul Barry (pbarry(AT)wit.ie), Jun 14 2008