A010679 Period 2: repeat (0,8).

0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0, 8, 0

Offset

0,2

Links

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

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

Formula

a(n) = 4*(1-(-1)^n) = 8*(n mod 2). - Paolo P. Lava, Oct 20 2006

G.f.: 8*x/((1-x)*(1+x)). - R. J. Mathar, Nov 21 2011

a(n) = 3^(1-(-1)^n) - 1. - Bruno Berselli, Dec 29 2015

Mathematica

PadRight[{}, 120, {0, 8}] (* Harvey P. Dale, Dec 21 2015 *)

Prog

(Magma) &cat [[0, 8]^^40]; // Bruno Berselli, Dec 29 2015
(PARI) a(n)=n%2*8 \\ Charles R Greathouse IV, Jul 26 2016

Crossrefs

Cf. A010700: 3^(1-(-1)^n) + 1.

Sequence in context: A066606 A048729 A003131 * A347157 A186981 A347159

Adjacent sequences: A010676 A010677 A010678 * A010680 A010681 A010682

Keyword

nonn,easy

Author

N. J. A. Sloane.

Status

approved