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Search: id:A130806
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| A130806 |
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Period 6: 1,4,3,-1,-4,-3. |
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+0
2
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| 1, 4, 3, -1, -4, -3, 1, 4, 3, -1, -4, -3, 1, 4, 3, -1, -4, -3, 1, 4, 3, -1, -4, -3
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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a(n)=(1/6)*{-4*(n mod 6)-[(n+1) mod 6]+3*[(n+2) mod 6]+4*[(n+3) mod 6]+[(n+4) mod 6]-3*[(n+5) mod 6]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Aug 28 2007
a(n) = a(n-1)-a(n-2) = A010892(n)+3*A010892(n-1). G.f.: (1+3*x)/(1-x+x^2). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Oct 15 2009]
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CROSSREFS
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Sequence in context: A010306 A006467 A119505 this_sequence A016499 A066204 A154278
Adjacent sequences: A130803 A130804 A130805 this_sequence A130807 A130808 A130809
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KEYWORD
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sign
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jul 16 2007
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EXTENSIONS
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Edited by N. J. A. Sloane (njas(AT)research.att.com), Sep 15 2007
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