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A010696
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Periodic sequence: Repeat 2,6.
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7
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2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2, 6, 2
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| Original name: Period 2.
Also continued fraction expansion of 1+(2/3)*sqrt(3). - Bruno Berselli, Sep 22 2011
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (0,1)
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FORMULA
| a(n) = -2*(-1)^n+4. a(n) = 6*(n mod 2)+2*((n+1) mod 2). - Paolo P. Lava, Oct 20 2006
G.f.: ( -2-6*x ) / ( (x-1)*(1+x) ). - R. J. Mathar, Jul 07 2011
a(n) = a(-n) = 2*A010684(n) = A131800(2n+1) = A010123(2n+2). - Bruno Berselli, Sep 22 2011
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CROSSREFS
| Cf. A174114. [From Reinhard Zumkeller, Mar 08 2010]
Sequence in context: A196201 A128045 A011325 * A021796 A127356 A163904
Adjacent sequences: A010693 A010694 A010695 * A010697 A010698 A010699
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KEYWORD
| nonn,easy
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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EXTENSIONS
| Definition rewritten by Bruno Berselli, Sep 22 2011
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