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Search: id:A134142
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| A134142 |
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List of quadruples: 2*(-4)^n, -3*(-4)^n, 2*(-4^n), 2*(-4)^n, n >= 0. |
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+0
2
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| 2, -3, 2, 2, -8, 12, -8, -8, 32, -48, 32, 32, -128, 192, -128, -128, 512, -768, 512, 512, -2048, 3072, -2048, -2048, 8192, -12288, 8192, 8192, -32768, 49152, -32768, -32768, 131072, -196608, 131072, 131072, -524288, 786432, -524288, -524288, 2097152, -3145728, 2097152, 2097152, -8388608
(list; graph; listen)
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OFFSET
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0,1
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FORMULA
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O.g.f.: (x+2)/(2*x^2+2*x+1). a(n) = 2*A108520(n)+A108520(n-1) . - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2008
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MAPLE
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A134142 := proc(n) (-4)^floor(n/4)*op(1+(n mod 4), [2, -3, 2, 2]) ; end: for n from 0 to 80 do printf("%d ", A134142(n)) ; od: - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2008
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CROSSREFS
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Cf. A081147, A134654.
Sequence in context: A093797 A119809 A007653 this_sequence A138680 A123703 A105436
Adjacent sequences: A134139 A134140 A134141 this_sequence A134143 A134144 A134145
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KEYWORD
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nonn,tabf,easy
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jan 29 2008
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EXTENSIONS
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More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Feb 05 2008
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