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A132367
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Period 6: repeat 1, 1, 2, -1, -1, -2.
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4
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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, -2, 1, 1, 2, -1, -1, -2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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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)*{-3*(n mod 6)+[(n+1) mod 6]+3*[(n+3) mod 6]-[(n+4) mod 6]}, with n>=0. - Paolo P. Lava (paoloplava(AT)gmail.com), Nov 19 2007
a(n) = cos(Pi*n/3)/3+sqrt(3)*sin(Pi*n/3)+2*(-1)^n/3. - R. J. Mathar, Oct 08 2011
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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
| Cf. A061347, A100051, A100063, A122876.
Sequence in context: A132419 A131556 A107751 * A087204 A101825 A177702
Adjacent sequences: A132364 A132365 A132366 * A132368 A132369 A132370
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KEYWORD
| sign,easy,less
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AUTHOR
| Paul Curtz (bpcrtz(AT)free.fr), Nov 09 2007
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