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A078040
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Expansion of (1-x)/(1+x-2*x^2+2*x^3).
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1
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1, -2, 4, -10, 22, -50, 114, -258, 586, -1330, 3018, -6850, 15546, -35282, 80074, -181730, 412442, -936050, 2124394, -4821378, 10942266, -24833810, 56361098, -127913250, 290303066, -658851762, 1495284394, -3393594050, 7701866362, -17479623250, 39670544074, -90033523298
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(0)=1, a(1)=-2, a(2)=4, a(n)=a(n-1)+2*a(n-2)-2*a(n-3) [From Harvey P. Dale, Dec 09 2011]
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MATHEMATICA
| CoefficientList[Series[(1-x)/(1+x-2x^2+2x^3), {x, 0, 40}], x] (* or *) LinearRecurrence[{-1, 2, -2}, {1, -2, 4}, 40] (* From Harvey P. Dale, Dec 09 2011 *)
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CROSSREFS
| First differences of A077970.
Sequence in context: A033497 A192627 A075560 * A164990 A121285 A030234
Adjacent sequences: A078037 A078038 A078039 * A078041 A078042 A078043
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KEYWORD
| sign
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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