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A077892
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Expansion of (1-x)^(-1)/(1+2*x^2-x^3).
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3
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1, 1, -1, 0, 4, 0, -7, 5, 15, -16, -24, 48, 33, -119, -17, 272, -84, -560, 441, 1037, -1441, -1632, 3920, 1824, -9471, 273, 20767, -10016, -41260, 40800, 72505, -122859, -104209, 318224, 85560, -740656, 147105, 1566873, -1034865, -2986640, 3636604, 4938416, -10259847, -6240227
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OFFSET
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0,5
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LINKS
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FORMULA
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a(0)=1, a(1)=1, a(2)=-1, a(3)=0, a(n)=a(n-1)-2*a(n-2)+3*a(n-3)-a(n-4). - Harvey P. Dale, Jul 27 2016
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MATHEMATICA
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CoefficientList[Series[(1-x)^(-1)/(1+2*x^2-x^3), {x, 0, 50}], x] (* or *) LinearRecurrence[{1, -2, 3, -1}, {1, 1, -1, 0}, 50] (* Harvey P. Dale, Jul 27 2016 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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STATUS
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approved
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