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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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3
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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
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OFFSET
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0,1
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LINKS
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FORMULA
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a(n) = (1 - I/2)*(-1 - I)^n + (1 + I/2)*(-1 + I)^n, n>=0. - Taras Goy, Apr 20 2019
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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, Feb 05 2008
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CROSSREFS
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KEYWORD
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tabf,easy,sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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