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A105811
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Expansion of (1+x-x^2)/(1+x)^2.
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6
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1, -1, 0, 1, -2, 3, -4, 5, -6, 7, -8, 9, -10, 11, -12, 13, -14, 15, -16, 17, -18, 19, -20, 21, -22, 23, -24, 25, -26, 27, -28, 29, -30, 31, -32, 33, -34, 35, -36, 37, -38, 39, -40, 41, -42, 43, -44, 45, -46, 47, -48, 49, -50, 51, -52, 53, -54, 55, -56, 57, -58, 59, -60, 61, -62, 63, -64, 65
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OFFSET
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0,5
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COMMENTS
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First column of number triangle A105810.
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LINKS
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FORMULA
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a(n) = -0^n-(-1)^n*(n-2).
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MATHEMATICA
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CoefficientList[Series[(1+x-x^2)/(1+x)^2, {x, 0, 70}], x] (* or *) LinearRecurrence[ {-2, -1}, {1, -1, 0}, 70] (* Harvey P. Dale, Jun 16 2016 *)
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PROG
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CROSSREFS
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KEYWORD
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easy,sign
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AUTHOR
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STATUS
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approved
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