

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
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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 Etoothpick (or snowflake) structure of A161330 appear at nth 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) ) / ( (x1)*(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



