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A229737
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G.f.: x^2*(1-x)*(1-4*x+4*x^2+x^3)/((1-2*x)^2*(1-3*x+x^2)).
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0
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0, 0, 1, 2, 5, 14, 40, 114, 322, 900, 2490, 6826, 18564, 50146, 134690, 360068, 958826, 2545082, 6737860, 17799570, 46939378, 123608388, 325130970, 854405962, 2243591940, 5887904194, 15444237890, 40495141124, 106146043082, 278161091930, 728790217540, 1909149084786, 5000603193874, 13096687028676, 34297779391290
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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CoefficientList[Series[x^2*(1 - x)*(1 - 4*x + 4*x^2 + x^3)/((1 - 2*x)^2*(1 - 3*x + x^2)), {x, 0, 34}], x] (* Amiram Eldar, Oct 08 2020 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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