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A132954
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Period 6: repeat 1, 2, 4, -1, -2, -4.
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2
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1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4, 1, 2, 4, -1, -2, -4
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OFFSET
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0,2
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COMMENTS
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Nonsimple continued fraction expansion of (5+sqrt(13))/6 = 1.434258545... - R. J. Mathar, Mar 08 2012
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LINKS
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Table of n, a(n) for n=0..65.
Index entries for sequences related to linear recurrences with constant coefficients, signature (0,0,-1).
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FORMULA
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a(n)=(1/6)*{-5*(n mod 6)+2*[(n+1) mod 6]+[(n+2) mod 6]+5*[(n+3) mod 6]-2*[(n+4) mod 6]-[(n+5) mod 6]} - Paolo P. Lava, Nov 30 2007
a(n) = -a(n-3). G.f.: (1+2*x+4*x^2)/((1+x) * (x^2-x+1)). [From R. J. Mathar, Apr 13 2010]
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PROG
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(PARI) a(n)=(2^n%7)*(-1)^(n%6>2) [From Jaume Oliver Lafont, Mar 24 2009]
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CROSSREFS
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Sequence in context: A215905 A206475 A124911 * A069705 A106645 A115314
Adjacent sequences: A132951 A132952 A132953 * A132955 A132956 A132957
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KEYWORD
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sign,easy
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AUTHOR
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Paul Curtz, Nov 19 2007
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STATUS
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approved
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