Search: id:A155559
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%I A155559
%S A155559 0,2,4,8,16,32,64,128,256,512,1024,2048,4096,8192,16384,32768,65536
%N A155559 a(n)=2*A131577(n).
%C A155559 Essentially the same as A131577, A046055, A011782, A000079 and A034008.
%F A155559 a(n)=A000079(n), n>0.
%F A155559 a(n)= (-1)^(n+1)*A084633(n+1).
%F A155559 a(n) + A155543(n) = 2^n+4^n = A063376(n) = 2*A007582(n) =2*A137173(2n+1).
%F A155559 Conjecture: a(n) = A090129(n+3)-A090129(n+2).
%F A155559 G.f.: 2x/(1-2x). [R. J. Mathar, Jul 23 2009]
%Y A155559 Sequence in context: A145117 A133025 A118655 this_sequence A166687 A011782 
               A034008
%Y A155559 Adjacent sequences: A155556 A155557 A155558 this_sequence A155560 A155561 
               A155562
%K A155559 nonn,easy,less
%O A155559 0,2
%A A155559 Paul Curtz (bpcrtz(AT)free.fr), Jan 24 2009
%E A155559 Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 23 2009

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