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A192080
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Expansion of 1/((1-x)^6 - x^6).
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9
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1, 6, 21, 56, 126, 252, 463, 804, 1365, 2366, 4368, 8736, 18565, 40410, 87381, 184604, 379050, 758100, 1486675, 2884776, 5592405, 10919090, 21572460, 43144920, 87087001, 176565486, 357913941, 723002336, 1453179126, 2906358252
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OFFSET
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0,2
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LINKS
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FORMULA
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G.f.: 1/((1-2*x)*(1-x+x^2)*(1-3*x+3*x^2)).
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MATHEMATICA
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CoefficientList[Series[1/((1-2*x)*(1-x+x^2)*(1-3*x+3*x^2)), {x, 0, 50}], x] (* Vincenzo Librandi, Oct 15 2012 *)
LinearRecurrence[{6, -15, 20, -15, 6}, {1, 6, 21, 56, 126}, 30] (* Harvey P. Dale, Feb 22 2017 *)
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PROG
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(Magma) m:=30; R<x>:=PowerSeriesRing(Integers(), m); Coefficients(R!(1/((1-2*x)*(1-x+x^2)*(1-3*x+3*x^2))));
(Maxima) makelist(coeff(taylor(1/((1-2*x)*(1-x+x^2)*(1-3*x+3*x^2)), x, 0, n), x, n), n, 0, 29);
(SageMath)
P.<x> = PowerSeriesRing(ZZ, prec)
return P( 1/((1-x)^6-x^6) ).list()
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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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