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Search: id:A131078
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| A131078 |
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Periodic sequence (1, 1, 1, 1, 0, 0, 0, 0). |
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+0
6
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| 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 1
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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First column of triangular array T defined in A131074.
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FORMULA
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a(1) = a(2) = a(3) = a(4) = 1, a(5) = a(6) = a(7) = a(8) = 0; for n > 8, a(n) = a(n-8).
G.f.: 1/((1-x)*(1+x^4)).
a(n)=1/56*{-6*(n mod 8)+[(n+1) mod 8]+[(n+2) mod 8]+[(n+3) mod 8]+8*[(n+4) mod 8]+[(n+5) mod 8]+[(n+6) mod 8]+[(n+7) mod 8]}, with n>=0. - Paolo P. Lava (ppl(AT)spl.at), Jun 19 2007
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PROGRAM
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(PARI) {m=105; for(n=1, m, print1((n-1)%8<4, ", "))}
(MAGMA) m:=105; [ [1, 1, 1, 1, 0, 0, 0, 0][ (n-1) mod 8 + 1 ]: n in [1..m] ];
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CROSSREFS
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Cf. A131074, A088911.
Sequence in context: A127872 A129564 A025447 this_sequence A130657 A084846 A130093
Adjacent sequences: A131075 A131076 A131077 this_sequence A131079 A131080 A131081
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KEYWORD
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nonn
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AUTHOR
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Klaus Brockhaus (klaus-brockhaus(AT)t-online.de), following a suggestion of Paul Curtz (bpcrtz(AT)free.fr), Jun 14 2007
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