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A140976 Period length 10: repeat 8, 8, 6, 6, 4, 4, 2, 2, 0, 0. 0
8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0, 8, 8, 6, 6, 4, 4, 2, 2, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

The subsequence of even terms of A140975.

LINKS

Table of n, a(n) for n=0..89.

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

FORMULA

Also doubled A059631(n+1) mod 10.

a(n) = (1/45)*(-32*(n mod 10) + 4*((n+1) mod 10) + 13*((n+2) mod 10) + 4*((n+3) mod 10) + 13*((n+4) mod 10) + 4*((n+5) mod 10) + 13*((n+6) mod 10) + 4*((n+7) mod 10) + 13*((n+8) mod 10) + 4*((n+9) mod 10)), with n >= 0. - Paolo P. Lava, Aug 04 2008

G.f.: ( -8-6*x^2-4*x^4-2*x^6 ) / ( (x-1)*(1+x+x^2+x^3+x^4)*(1-x+x^2-x^3+x^4) ). - R. J. Mathar, Jul 08 2011

MATHEMATICA

PadRight[{}, 100, {8, 8, 6, 6, 4, 4, 2, 2, 0, 0}] (* Harvey P. Dale, Jun 03 2012 *)

CROSSREFS

Cf. A059631, A140975, A177154.

Sequence in context: A202497 A195708 A019704 * A253270 A021057 A335494

Adjacent sequences:  A140973 A140974 A140975 * A140977 A140978 A140979

KEYWORD

nonn,easy,less

AUTHOR

Paul Curtz, Jul 28 2008

EXTENSIONS

More terms from Jinyuan Wang, Feb 26 2020

STATUS

approved

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Last modified December 4 15:46 EST 2020. Contains 338928 sequences. (Running on oeis4.)