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A010707 Period 2: repeat (3,9). 2
3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3, 9, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

Continued fraction expansion of A176108. - R. J. Mathar, Mar 08 2012

LINKS

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

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

FORMULA

a(n) = -3*(-1)^n+6 = 9*(n mod 2)+3*[(n+1) mod 2]. - Paolo P. Lava, Oct 20 2006

G.f.: 3(1+3x)/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011

MATHEMATICA

PadRight[{}, 120, {3, 9}] (* Harvey P. Dale, Nov 07 2017 *)

PROG

(PARI) a(n)=3+n%2*6 \\ Charles R Greathouse IV, Dec 21 2011

CROSSREFS

Sequence in context: A231828 A268580 A179802 * A097665 A284564 A170862

Adjacent sequences:  A010704 A010705 A010706 * A010708 A010709 A010710

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 17 02:10 EDT 2019. Contains 325092 sequences. (Running on oeis4.)