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Search: id:A132429
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| A132429 |
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Period 4: repeat 3, 1, -1, -3. |
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+0
4
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| 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1, -1, -3, 3, 1
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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Differences: -2(1, 1, 1, -3).
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FORMULA
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a(n)=(1/2)*{-3*(n mod 4)+[(n+1) mod 4]+[(n+2) mod 4]+[(n+3) mod 4]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Nov 19 2007
G.f.: (3+4*x+3*x^2)/((1+x)*(1+x^2)) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Aug 30 2009]
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PROGRAM
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(PARI) a(n)=3-2*(n%4) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Aug 28 2009]
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CROSSREFS
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Cf. A084101(1, 3, 3, 1).
Sequence in context: A143159 A033989 A099545 this_sequence A046540 A123191 A157454
Adjacent sequences: A132426 A132427 A132428 this_sequence A132430 A132431 A132432
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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), Nov 13 2007
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