Search: id:A158197
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%I A158197
%S A158197 1,4,23,140,866,5388,33603,209796,1310510,8188328,51169094,319779544,
%T A158197 1998527188,12490460620,78064190235,487896926580,3049340393430,
%U A158197 19058321475960,119114304522450,744463650984360,4652895041524380
%N A158197 Expansion of (1-x^2*c(x)^4)/(1-4*x*c(x)^2), c(x) the g.f. of A000108.
%C A158197 Apply the inverse of the Riordan array (1/(1-x^2),x/(1+x)^2) to 4^n. 
               Hankel transform is A070997.
%Y A158197 Cf. A090317, A158196.
%Y A158197 Sequence in context: A038723 A091640 A067110 this_sequence A038736 A091642 
               A162561
%Y A158197 Adjacent sequences: A158194 A158195 A158196 this_sequence A158198 A158199 
               A158200
%K A158197 easy,nonn
%O A158197 0,2
%A A158197 Paul Barry (pbarry(AT)wit.ie), Mar 13 2009

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