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A132798
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Period 6: repeat 0, 2, 1, 0, -2, -1.
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0
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0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1, 0, 2, 1, 0, -2, -1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| O.g.f.: x*(2+x)/((x+1)*(x^2-x+1)) = (1/3)*(4*x+1)/(x^2-x+1)-(1/3)/(x+1) . R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 28 2007
a(n)=(1/6)*{-(n mod 6)-[(n+1) mod 6]+2*[(n+2) mod 6]+[(n+3) mod 6]+[(n+4) mod 6]-2*[(n+5) mod 6]} - Paolo P. Lava (paoloplava(AT)gmail.com), Nov 30 2007
a(n)+a(n+1)=A117373(n+4). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jul 22 2009]
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CROSSREFS
| Cf. A129339.
Sequence in context: A112201 A112203 A196279 * A080425 A048141 A025664
Adjacent sequences: A132795 A132796 A132797 * A132799 A132800 A132801
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KEYWORD
| sign
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Nov 21 2007
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