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A138034
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Expansion of (1+3*x^2)/(1-x+x^2).
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11
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1, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3, 2, -1, -3, -2, 1, 3
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OFFSET
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0,3
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REFERENCES
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Karem Boubaker and Lin Zhang, Fermat-linked relations for the Boubaker polynomial sequences via Riordan matrices analysis, Arxiv preprint arXiv:1203.2082, 2012. - From N. J. A. Sloane, Sep 15 2012
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LINKS
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Table of n, a(n) for n=0..104.
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FORMULA
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a(n) = A119910(n), n>0.
G.f.: (1+3*x^2)/(1-x+x^2). a(n)=a(n-1)-a(n-2), n>2.
a(n)=3*[C(2*n,n) mod 2]+(1/6)*{-(n mod 6)+2*[(n+1) mod 6]+3*[(n+2) mod 6]+[(n+3) mod 6]-2*[(n+4) mod 6]-3*[(n+5) mod 6]}, with n>=0. - Paolo P. Lava, Mar 18 2008
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CROSSREFS
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Cf. A135929, A135936, A137276.
Sequence in context: A070309 A130784 A119910 * A087818 A112746 A107460
Adjacent sequences: A138031 A138032 A138033 * A138035 A138036 A138037
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KEYWORD
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sign,easy
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AUTHOR
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Karem Boubaker (mmbb11112000(AT)yahoo.fr), Mar 01 2008; corrected Mar 03 2008
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EXTENSIONS
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A-numbers corrected by R. J. Mathar, Dec 08 2009
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STATUS
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approved
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