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A010729 8-(-1)^n. 6
7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7, 9, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n+1) = A173512(n+1) - A173512(n). - Reinhard Zumkeller, Feb 20 2010

LINKS

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

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

FORMULA

Period 2.

a(n)=(-1)^(n+1)+8 a(n)=9*(n mod 2)+7*[(n+1) mod 2] - Paolo P. Lava, Oct 27 2006

G.f. ( -7-9*x ) / ( (x-1)*(1+x) ). - R. J. Mathar, Nov 21 201

MATHEMATICA

PadRight[{}, 100, {7, 9}] (* Harvey P. Dale, May 09 2012 *)

PROG

(PARI) a(n)=8-(-1)^n \\ Charles R Greathouse IV, Jun 11 2015

CROSSREFS

Sequence in context: A199742 A258112 A076668 * A182688 A256924 A259069

Adjacent sequences:  A010726 A010727 A010728 * A010730 A010731 A010732

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 22 05:47 EDT 2019. Contains 325213 sequences. (Running on oeis4.)