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A172399
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Expansion of x^7/(1-2*x-2*x^2+x^3+x^8).
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0
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1, 2, 6, 15, 40, 104, 273, 714, 1869, 4891, 12800, 33498, 87665, 229422, 600403, 1571271, 4112057, 10761362, 28162767, 73702703, 192881913, 504777043, 1321014806, 3457130514, 9047401540, 23677287940, 61964085679, 162161642995, 424381287495, 1110616998258
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OFFSET
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7,2
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LINKS
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FORMULA
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G.f.: x^7/(1-2*x-2*x^2+x^3+x^8).
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MATHEMATICA
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Drop[CoefficientList[Series[x^7/(1-2x-2x^2+x^3+x^8), {x, 0, 40}], x], 7] (* or *) LinearRecurrence[{2, 2, -1, 0, 0, 0, 0, -1}, {1, 2, 6, 15, 40, 104, 273, 714}, 30] (* Harvey P. Dale, May 05 2014 *)
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CROSSREFS
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KEYWORD
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nonn,easy,less
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AUTHOR
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STATUS
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approved
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