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