Search: id:A068217
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%I A068217
%S A068217 2,4,2,8,10,4,14,16,6,20,22,8,26,28,10,32,34,12,38,40,14,44,46,16,50,
%T A068217 52,18,56,58,20,62,64,22,68,70,24,74,76,26,80,82,28,86,88,30,92,94,32,
%U A068217 98,100,34,104,106,36,110,112,38,116,118,40,122,124,42,128,130,44,134
%N A068217 Denominators of coefficients in ln(1+x)*sqrt(1+x) power series.
%C A068217 Numerators are b(n)=(-1)^(n+1) if n==0 (mod 3) b(n)=(-1)^(n+1)*3 otherwise
%F A068217 a(n)=2n/3 if n==0 (mod 3) a(n)=2n otherwise ln(1+x)*sqrt(1+x)=-3*sum(k>
               =1, (-x)^k/(2k))
%F A068217 a(n) = 2*A038502(n) (from Mitch Harris, Jun 29 2005)
%Y A068217 Sequence in context: A129178 A152874 A065286 this_sequence A114593 A114655 
               A051288
%Y A068217 Adjacent sequences: A068214 A068215 A068216 this_sequence A068218 A068219 
               A068220
%K A068217 easy,frac,nonn
%O A068217 1,1
%A A068217 Benoit Cloitre (benoit7848c(AT)orange.fr), Mar 30 2002

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