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Search: id:A135695
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| A135695 |
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Period 6: repeat -1, -1, -2, -2, 3, 3. |
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+0
1
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| -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3, 3, -1, -1, -2, -2, 3
(list; graph; listen)
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OFFSET
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0,3
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FORMULA
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a(n)=(1/6)*{4*(n mod 6)-5*[(n+2) mod 6]+[(n+4) mod 6]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Mar 03 2008
a(n)=a(n-6) = -a(n-2)-a(n-4) . O.g.f.: -(x+1)*(3*x^2+1)/[(x^2-x+1)(x^2+x+1)]. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Mar 31 2008
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CROSSREFS
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Cf. A105899.
Adjacent sequences: A135692 A135693 A135694 this_sequence A135696 A135697 A135698
Sequence in context: A143797 A079729 A071859 this_sequence A105899 A071434 A128924
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KEYWORD
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sign,easy,more
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Feb 24 2008
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