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Search: id:A133730
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| 1, 0, -1, 1, 1, 1, -1, 3, 1, 5, -1, 11, 1, 21, -1, 43, 1, 85, -1, 171, 1, 341, -1, 683, 1, 1365, -1, 2731, 1, 5461
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OFFSET
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0,8
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FORMULA
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a(2n) = (-1)^n. a(2n+1) = A001045(n). O.g.f.: -(x-1)*(x^2-x-1)/[(2*x^2-1)*(1+x^2)] . a(n) = A133684(n+1)-A133684(n). First differences: a(2n)-a(2n+1) = -2*A001045(n-2) for n>=3; a(2n+1)-a(2n) = 4*A001045(n-2) for n >=2. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 09 2008
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CROSSREFS
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Sequence in context: A146434 A126213 A146935 this_sequence A112031 A146285 A146059
Adjacent sequences: A133727 A133728 A133729 this_sequence A133731 A133732 A133733
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KEYWORD
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sign
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jan 04 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 09 2008
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