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A010696 Periodic sequence: Repeat 2,6. 8
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; text; internal format)
OFFSET

0,1

COMMENTS

Original name: Period 2.

Also continued fraction expansion of 1+(2/3)*sqrt(3).  - Bruno Berselli, Sep 22 2011

LINKS

Table of n, a(n) for n=0..80.

Index entries for linear recurrences with constant coefficients, signature (0,1)

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

CROSSREFS

Cf. A174114. [From Reinhard Zumkeller, Mar 08 2010]

Sequence in context: A196201 A128045 A011325 * A021796 A127356 A232273

Adjacent sequences:  A010693 A010694 A010695 * A010697 A010698 A010699

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

EXTENSIONS

Definition rewritten by Bruno Berselli, Sep 22 2011

STATUS

approved

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Last modified July 17 08:42 EDT 2019. Contains 325098 sequences. (Running on oeis4.)