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Search: id:A131291
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| A131291 |
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Period 9: repeat 5, 4, 5, 3, 4, 3, 5, 4, 5. |
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+0
12
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| 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4, 5, 3, 4, 3, 5, 4, 5, 5, 4
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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a(n)=(1/108)*{13*(n mod 9)+[(n+1) mod 9]+25*[(n+2) mod 9]+[(n+3) mod 9]+[(n+4) mod 9]+25*[(n+5) mod 9]+25*[(n+6) mod 9]+[(n+7) mod 9]+25*[(n+8) mod 9]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 24 2007
O.g.f.: (1-x)/(9(x^2+x+1))+2(1+x^2-x^3-x^5)/(3(x^6+x^3+1))-38/(9(x-1)). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 17 2008
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MAPLE
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A131291 := proc(n) op((n mod 9)+1, [5, 4, 5, 3, 4, 3, 5, 4, 5]) ; end: seq(A131291(n), n=0..100) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2008
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CROSSREFS
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Cf. A122219.
Sequence in context: A123587 A018840 A058209 this_sequence A131369 A122219 A093348
Adjacent sequences: A131288 A131289 A131290 this_sequence A131292 A131293 A131294
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KEYWORD
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nonn,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Sep 29 2007
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 27 2008
Typo in definition corrected by Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 22 2008
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