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A117452
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Periodic{2,-1,1,0,0}-0^n.
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2
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1, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0, 2, -1, 1, 0, 0
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,6
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COMMENTS
| Partial sums are A117451. Second partial sums are A117450.
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FORMULA
| G.f.: (1-x+x^2+x^5)/(1-x^5)
a(n)=(1/25)*{-9*(n mod 5)+[(n+1) mod 5]+6*[(n+2) mod 5]-9*[(n+3) mod 5]+16*[(n+4) mod 5]}+[(n+2) mod (n+1)]-1, with n>=0. - Paolo P. Lava (paoloplava(AT)gmail.com), Jul 19 2007
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CROSSREFS
| Sequence in context: A078807 A029422 A152800 * A029412 A178670 A026921
Adjacent sequences: A117449 A117450 A117451 * A117453 A117454 A117455
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KEYWORD
| easy,sign
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AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Mar 16 2006
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