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Search: id:A131713
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| A131713 |
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Period 3: repeat 1, -2, 1. |
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+0
1
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| 1, -2, 1, 1, -2, 1, 1, -2, 1, 1, -2, 1, 1, -2, 1, 1, -2, 1, 1, -2, 1, 1, -2, 1, 1, -2, 1, -2, 1
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Second differences of A131534. Binomial transform of 1, -3,6, -9, 9, 0 ..., A057083 signed.
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FORMULA
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a(n)={-[(n+1) mod 3]+[(n+2) mod 3]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 02 2007
G.f.: -(x-1)/(x^2+x+1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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CROSSREFS
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Cf. A131534, A057083, A061347, A131556.
Sequence in context: A115581 A115576 A115572 this_sequence A115571 A115580 A115583
Adjacent sequences: A131710 A131711 A131712 this_sequence A131714 A131715 A131716
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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 14 2007
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