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A212126 Period 13: repeat (0,0,1,0,0,1,0,1,0,0,1,0,1). 1
0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0

COMMENTS

a(1)-a(42) coincide with A085242.

Consider the sequence in which a(n) = 1 if two rhombuses that are adjacent to one of the six spokes of the E-toothpick (or snowflake) structure of A161330 appear at n-th stage, otherwise 0. Is this the same as the mentioned sequence? If not, where is the first place these sequences differ? - Omar E. Pol, Feb 28 2013

LINKS

Table of n, a(n) for n=0..90.

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

FORMULA

G.f. -x^2*(1 +x^3 +x^5 +x^8 +x^10) ) / ( (x-1)*(1 +x^12 +x^11 +x^10 +x^9 +x^8 +x^7 +x^6 +x^5 +x^4 +x^3 +x^2 +x) ). - R. J. Mathar, Mar 04 2013

MATHEMATICA

PadRight[{}, 120, {0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1}] (* Harvey P. Dale, Apr 13 2016 *)

PROG

(PARI) a(n)=[0, 0, 1, 0, 0, 1, 0, 1, 0, 0, 1, 0, 1][n%13+1] \\ Charles R Greathouse IV, Jul 17 2016

CROSSREFS

Cf. A085242, A161330.

Very similar to but different from A189661. - N. J. A. Sloane, Mar 08 2017

Sequence in context: A289239 A188432 A282317 * A144605 A154103 A116178

Adjacent sequences:  A212123 A212124 A212125 * A212127 A212128 A212129

KEYWORD

nonn,easy

AUTHOR

Omar E. Pol, Dec 19 2012

STATUS

approved

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Last modified July 29 10:26 EDT 2021. Contains 346344 sequences. (Running on oeis4.)