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A010713 Period 2: repeat (4,8). 2
4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4, 8, 4 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

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 + 6 = 8*(n mod 2) + 4*[(n+1) mod 2]. - Paolo P. Lava, Oct 20 2006

From R. J. Mathar, Oct 20 2008: (Start)

a(n) = 4*A000034(n).

G.f.: 4(1+2x)/((1-x)(1+x)). (End)

MATHEMATICA

Table[4 + 4 Mod[n, 2], {n, 0, 50}] (* Jinyuan Wang, Feb 26 2020 *)

PROG

(PARI) a(n)=4+n%2*4 \\ Charles R Greathouse IV, Dec 21 2011

CROSSREFS

Cf. A176218.

Sequence in context: A247318 A019838 A155970 * A105398 A005883 A055026

Adjacent sequences:  A010710 A010711 A010712 * A010714 A010715 A010716

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified November 30 20:55 EST 2020. Contains 338812 sequences. (Running on oeis4.)