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Search: id:A142888
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| 3, -1, 13, -9, 29, -23, 51, -43, 79, -69, 113, -101, 153, -139, 199, -183, 251, -233, 309, -289, 373, -351, 443, -419
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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Also obtained from A135370 if adjacent pairs are swapped and if the sequence is then multiplied by (-1)^(n+1).
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FORMULA
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a(n)=A142705(n+1)-A142705(n).
a(2n-1)+a(2n) = A005843(n).
G.f.: x(3+2x+6x^2-x^4)/(1+x)^3*(1-x)^2). - R. J. Mathar, Oct 24 2008
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CROSSREFS
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Sequence in context: A152474 A088814 A088729 this_sequence A068439 A133171 A133177
Adjacent sequences: A142885 A142886 A142887 this_sequence A142889 A142890 A142891
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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), Sep 29 2008
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EXTENSIONS
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Edited by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 24 2008
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