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Search: id:A131185
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| A131185 |
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Period 6: repeat 0, 2, -1, 0, -1, 3. |
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+0
1
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| 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3, 0, 2, -1, 0, -1, 3
(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)*{16*(n mod 6)-19*[(n+1) mod 6]+6*[(n+2) mod 6]-4*[(n+3) mod 6]+16*[(n+4) mod 6]-9*[(n+5) mod 6]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 24 2007
a(n)=a(n-6). G.f.: x(2-x-x^3+3x^4)/((1-x)(1+x)(1+x+x^2)(1-x+x^2)). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009]
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CROSSREFS
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Sequence in context: A138107 A089631 A129558 this_sequence A052249 A030528 A077227
Adjacent sequences: A131182 A131183 A131184 this_sequence A131186 A131187 A131188
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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 25 2007
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EXTENSIONS
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More periods from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 07 2009
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