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A010681 Period 2: repeat (0,10). 0
0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10, 0, 10 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..65.

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

FORMULA

a(n)=5*[1-(-1)^n] =10*(n mod 2) - Paolo P. Lava, Oct 20 2006

G.f.: 10x/((1-x)(1+x)). - R. J. Mathar, Nov 21 2011

MATHEMATICA

PadRight[{}, 120, {0, 10}] (* Harvey P. Dale, Jan 15 2016 *)

PROG

(PARI) a(n)=n%2*10 \\ Charles R Greathouse IV, Jul 13 2016

CROSSREFS

Sequence in context: A063741 A320227 A284780 * A095418 A055961 A196081

Adjacent sequences:  A010678 A010679 A010680 * A010682 A010683 A010684

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 15 10:15 EDT 2019. Contains 328026 sequences. (Running on oeis4.)