Search: id:A141244
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%I A141244
%S A141244 0,0,1,1,5,5,11,11,93,93,193,193,793,793,1619,1619,26333,26333,53381,
%T A141244 53381,215955,215955,436109,436109,3518265,3518265,7088533,7088533,
%U A141244 28539857,28539857,57414019
%N A141244 Numerators in expansion of (1-sqrt(1-x^2))/(1-x).
%C A141244 The denominators in the expansion of (1-sqrt(1-x^2))/(1-x) are 1,1,2,
               2,8,8,16,16,... or
%C A141244 2^A005187(n) doubled. The sequence 0,1/2,1/2,5/8,5/8,... is the image 
               of n under the
%C A141244 Chebyshev related (rational) Riordan array c((x/2)^2),(x/2)c((x/2)^2)) 
               with c(x) the g.f. of A000108.
%C A141244 The image of n+1 under this array is 1,1,1,....
%Y A141244 Cf. A120778.
%Y A141244 Sequence in context: A058610 A143427 A101203 this_sequence A121849 A164930 
               A098331
%Y A141244 Adjacent sequences: A141241 A141242 A141243 this_sequence A141245 A141246 
               A141247
%K A141244 easy,frac,nonn
%O A141244 0,5
%A A141244 Paul Barry (pbarry(AT)wit.ie), Jun 17 2008

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