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Search: id:A117188
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| A117188 |
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Expansion of (1-x^2)/(1+x^2+x^4). |
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+0
2
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| 1, 0, -2, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0, -2, 0, 1, 0, 1, 0
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Periodic {1,0,-2,0,1,0}. Row sums of A117185.
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FORMULA
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G.f.: (1-2x^2+x^4)/(1-x^6)
a(n)=(1/6)*{-[n mod 6]+[(n+1) mod 6]-[(n+2) mod 6]-2*[(n+3) mod 6]+2*[(n+4) mod 6]+[(n+5) mod 6]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 01 2007
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CROSSREFS
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Sequence in context: A137277 A039975 A016253 this_sequence A097796 A133565 A035169
Adjacent sequences: A117185 A117186 A117187 this_sequence A117189 A117190 A117191
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KEYWORD
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easy,sign
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AUTHOR
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Paul Barry (pbarry(AT)wit.ie), Mar 01 2006
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