Search: id:A113179
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%I A113179
%S A113179 1,2,4,12,40,128,408,1328,4384,14560,48576,162816,547936,1850048,
%T A113179 6263680,21257856,72298240,246345728,840775424,2873802240,9835840512,
%U A113179 33704557568,115622041600,397032488960,1364610270720,4694145256448
%N A113179 Expansion of 1/sqrt((1-2x)^2-8x^3).
%C A113179 In general, 1/sqrt((1-a*x)^2-4*b*x^3) expands to sum{k=0..floor(n/2), 
               C(n-k,k)C(n-2k,k)b^k*a^(n-3k)}.
%F A113179 a(n)=sum{k=0..floor(n/2), C(n-k, k)C(n-2k, k)2^(n-2k)}.
%Y A113179 Cf. A098479.
%Y A113179 Sequence in context: A008404 A099214 A126946 this_sequence A056236 A028329 
               A025227
%Y A113179 Adjacent sequences: A113176 A113177 A113178 this_sequence A113180 A113181 
               A113182
%K A113179 easy,nonn
%O A113179 0,2
%A A113179 Paul Barry (pbarry(AT)wit.ie), Oct 16 2005

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