Search: id:A137505
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%I A137505
%S A137505 1,1,0,2,0,0,4,4,4,4,12,20,12,12,52,76,52,52,204,308,204,204,820,1228,
               820,820,
%T A137505 3276,4916,3276,3276,13108,19660,13108,13108,52428,78644,52428,52428,209716,
%U A137505 314572,209716,209716,838860,1258292,838860,838860,3355444,5033164,3355444
%V A137505 1,1,0,2,0,0,4,-4,4,4,-12,20,-12,-12,52,-76,52,52,-204,308,-204,-204,820,
               -1228,820,820,
%W A137505 -3276,4916,-3276,-3276,13108,-19660,13108,13108,-52428,78644,-52428,-52428,
               209716,
%X A137505 -314572,209716,209716,-838860,1258292,-838860,-838860,3355444,-5033164,
               3355444
%N A137505 Inverse binomial transform of A007910.
%F A137505 a(n)=-a(n-1)+2a(n-3).
%F A137505 a(n)= 4/5+(1/10+1/5*I)*(-1-I)^n+(1/10-1/5*I)*(-1+I)^n, with n>=0 and 
               I=sqrt(-1) - Paolo P. Lava (ppl(AT)spl.at), Jun 03 2008
%F A137505 O.g.f.: (1+x)^2/((1-x)(1+2x+2x^2)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Jun 12 2008
%Y A137505 Sequence in context: A072070 A137828 A137830 this_sequence A107498 A094295 
               A085969
%Y A137505 Adjacent sequences: A137502 A137503 A137504 this_sequence A137506 A137507 
               A137508
%K A137505 sign
%O A137505 0,4
%A A137505 Paul Curtz (bpcrtz(AT)free.fr), Apr 23 2008
%E A137505 More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jun 12 2008

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