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A132419
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Period 6: repeat 1, 1, -2, -1, -1, 2.
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1
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1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1, 2, 1, 1, -2, -1, -1
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| A061347, 1, 1, -2, followed by its opposite.
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LINKS
| Index entries for sequences related to linear recurrences with constant coefficients, signature (0,0,-1).
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FORMULA
| a(n)=(1/6)*{(n mod 6)-[(n+1) mod 6]-[(n+3) mod 6]+[(n+4) mod 6]}, with n>=0. - Paolo P. Lava (paoloplava(AT)gmail.com), Nov 19 2007
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PROG
| (PARI) a(n)=[1, 1, -2, -1, -1, 2][n%6+1] \\ Charles R Greathouse IV, Jun 02 2011
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CROSSREFS
| Sequence in context: A122876 A100063 A057079 * A131556 A107751 A132367
Adjacent sequences: A132416 A132417 A132418 * A132420 A132421 A132422
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KEYWORD
| sign,easy,less
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Nov 13 2007
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