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A078056
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Expansion of (1-x)/(1+2*x-x^2-x^3).
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1
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1, -3, 7, -16, 36, -81, 182, -409, 919, -2065, 4640, -10426, 23427, -52640, 118281, -265775, 597191, -1341876, 3015168, -6775021, 15223334, -34206521, 76861355, -172705897, 388066628, -871977798, 1959316327, -4402543824, 9892426177, -22228079851, 49946042055, -112227737784
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OFFSET
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0,2
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COMMENTS
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Absolute values of pairwise sums are in A052534.
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LINKS
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FORMULA
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G.f.: (1-x)/(1+2*x-x^2-x^3).
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MATHEMATICA
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CoefficientList[Series[(1-x)/(1+2*x-x^2-x^3), {x, 0, 60}], x] (* Harvey P. Dale, Feb 20 2020 *)
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PROG
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(Magma) R<x>:=PowerSeriesRing(Integers(), 40); Coefficients(R!((1-x)/(1+2*x-x^2-x^3))); // Vincenzo Librandi, Feb 21 2020
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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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