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Search: id:A131712
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| A131712 |
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Period 4: repeat 1, 3, 7, 9 . |
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+0
1
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| 1, 3, 7, 9, 1, 3, 7, 9, 1, 3, 7, 9, 1, 3, 7, 9, 1, 3, 7, 9, 1, 3, 7, 9, 1, 3, 7, 9
(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)*{17*(n mod 6)+2*[(n+1) mod 4]-2*[(n+2) mod 4]-[(n+3) mod 4]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 02 2007
G.f.: -(1+3*x+7*x^2+9*x^3)/(x-1)/(x+1)/(1+x^2). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 14 2007
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CROSSREFS
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Cf. A131707, A072845.
Sequence in context: A105756 A101366 A090458 this_sequence A072845 A021729 A071641
Adjacent sequences: A131709 A131710 A131711 this_sequence A131713 A131714 A131715
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KEYWORD
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nonn
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 14 2007
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