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Search: id:A131290
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| A131290 |
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1 followed by period 6 sequence formed by repeating 3, 2, 0, -1, 0, 2. |
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+0
12
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| 1, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1, 0, 2, 3, 2, 0, -1
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=(1/30)*{-8*(n mod 6)-3*[(n+1) mod 6]+7*[(n+2) mod 6]+12*[(n+3) mod 6]+7*[(n+4) mod 6]-3*[(n+5) mod 6]}+[(n+2) mod (n+1)]-1, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 24 2007
O.g.f.: -1+(x+1)/(x^2-x+1)-1/(x-1). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2008
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MAPLE
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A131290 := proc(n) if n = 0 then 1; else op(((n-1)mod 6)+1, [3, 2, 0, -1, 0, 2]) ; fi ; end: seq(A131290(n), n=0..100) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2008
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CROSSREFS
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Cf. A130869, A079757, A100219.
Sequence in context: A062707 A059033 A133209 this_sequence A116604 A138741 A079618
Adjacent sequences: A131287 A131288 A131289 this_sequence A131291 A131292 A131293
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KEYWORD
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sign,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 29 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2008
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