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Search: id:A156283
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| A156283 |
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Period 6: repeat 1,2,4,-4,-2,-1. |
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+0
2
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| 1, 2, 4, -4, -2, -1, 1, 2, 4, -4, -2, -1, 1, 2, 4, -4, -2, -1, 1, 2, 4, -4, -2, -1, 1, 2, 4, -4, -2, -1, 1, 2, 4, -4, -2, -1, 1, 2, 4, -4, -2, -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)=(1/6)*{-2*(n mod 6)-[(n+1) mod 6]-2*[(n+2) mod 6]+8*[(n+3) mod 6]-2*[(n+4) mod 6]-[(n+5) mod 6]}, with n>=0 [From Paolo P. Lava (ppl(AT)spl.at), Feb 13 2009]
G.f.:(1+x^4+3*x^3+7*x^2+3*x)/((x+1)*(x^2-x+1)*(x^2+x+1)) [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 11 2009]
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CROSSREFS
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Sequence in context: A107500 A108620 A070512 this_sequence A156346 A126123 A096832
Adjacent sequences: A156280 A156281 A156282 this_sequence A156284 A156285 A156286
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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), Feb 07 2009
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