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Search: id:A131379
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| A131379 |
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Period 4: repeat 1, 0, -1, 1. |
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+0
1
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| 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1, 1, 0, -1, 1
(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)=(1/24)*{(n mod 4)-11*[(n+1) mod 4]+7*[(n+2) mod 4]+7*[(n+3) mod 4]}, with n>=0 - Paolo P. Lava (ppl(AT)spl.at), Oct 24 2007
a(n) = 1/4+cos(1/2*Pi*n)-1/2*sin(1/2*Pi*n)+1/4*(-1)^(1+n). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 15 2007
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CROSSREFS
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Sequence in context: A070749 A059778 A104521 this_sequence A090971 A105594 A091949
Adjacent sequences: A131376 A131377 A131378 this_sequence A131380 A131381 A131382
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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), Oct 01 2007
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