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A279313 Period 14 zigzag sequence: repeat [0,1,2,3,4,5,6,7,6,5,4,3,2,1]. 11
0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..85.

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

FORMULA

G.f.: x*(1 + x + x^2 + x^3 + x^4 + x^5 + x^6)/(1 - x + x^7 - x^8).

a(n) = a(n-1) - a(n-7) + a(n-8) for n > 7.

a(n) = abs(n - 14*round(n/14)).

a(n) = Sum_{i=1..n} (-1)^floor((i-1)/7).

a(2n) = 2*A279316(n), a(2n+1) = A279321(n).

MAPLE

A279313:=n->[0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1][(n mod 14)+1]: seq(A279313(n), n=0..200);

MATHEMATICA

CoefficientList[Series[x*(1 + x + x^2 + x^3 + x^4 + x^5 + x^6)/(1 - x + x^7 - x^8), {x, 0, 100}], x]

PROG

(MAGMA) &cat[[0, 1, 2, 3, 4, 5, 6, 7, 6, 5, 4, 3, 2, 1]: n in [0..10]];

(PARI) a(n)=([0, 1, 0, 0, 0, 0, 0, 0; 0, 0, 1, 0, 0, 0, 0, 0; 0, 0, 0, 1, 0, 0, 0, 0; 0, 0, 0, 0, 1, 0, 0, 0; 0, 0, 0, 0, 0, 1, 0, 0; 0, 0, 0, 0, 0, 0, 1, 0; 0, 0, 0, 0, 0, 0, 0, 1; 1, -1, 0, 0, 0, 0, 0, 1]^n*[0; 1; 2; 3; 4; 5; 6; 7])[1, 1] \\ Charles R Greathouse IV, Dec 12 2016

CROSSREFS

Period k zigzag sequences: A000035 (k=2), A007877 (k=4), A260686 (k=6), A266313 (k=8), A271751 (k=10), A271832 (k=12), this sequence (k=14), A279319 (k=16), A158289 (k=18).

Cf. A279316, A279321.

Sequence in context: A038389 A058223 A245355 * A063265 A211011 A232242

Adjacent sequences:  A279310 A279311 A279312 * A279314 A279315 A279316

KEYWORD

nonn,easy

AUTHOR

Wesley Ivan Hurt, Dec 09 2016

STATUS

approved

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Last modified October 21 17:10 EDT 2018. Contains 316427 sequences. (Running on oeis4.)