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A166446 Periodic (1,1,1,1,0,0,-1,-1,-1,-1,0,0). 2
1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0, 1, 1, 1, 1, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n+2) is the Hankel transform of A110199. - Paul Barry, Jun 23 2010

LINKS

Table of n, a(n) for n=0..77.

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

FORMULA

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

MATHEMATICA

LinearRecurrence[{0, 1, 0, -1}, {1, 1, 1, 1}, 50] (* G. C. Greubel, May 14 2016 *)

PROG

(MAGMA) &cat [[1, 1, 1, 1, 0, 0, -1, -1, -1, -1, 0, 0]^^10]; // Vincenzo Librandi, May 15 2016

CROSSREFS

Cf. A010892 (bisection)

Sequence in context: A285504 A130093 A115944 * A103368 A055132 A285403

Adjacent sequences:  A166443 A166444 A166445 * A166447 A166448 A166449

KEYWORD

easy,sign

AUTHOR

Paul Barry, Oct 13 2009

EXTENSIONS

Incorrect comment removed - R. J. Mathar, Oct 02 2012

STATUS

approved

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Last modified February 26 01:41 EST 2020. Contains 332270 sequences. (Running on oeis4.)