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A275639
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Expansion of (1-q)^k/Product_{j=1..k} (1-q^j) for k=5.
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3
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1, -4, 7, -7, 5, -4, 4, -4, 5, -7, 8, -8, 9, -11, 12, -11, 9, -8, 9, -11, 13, -15, 16, -15, 14, -15, 16, -15, 14, -15, 17, -19, 21, -22, 21, -19, 18, -19, 21, -22, 22, -23, 25, -26, 26, -26, 25, -23, 23, -26, 29, -30, 30, -30, 30, -30, 30, -30, 30, -30, 31, -34, 37, -37, 35, -34, 34, -34, 35
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OFFSET
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0,2
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LINKS
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Index entries for linear recurrences with constant coefficients, signature (-4,-9,-15,-20,-22,-20,-15,-9,-4,-1)
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FORMULA
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Equivalent g.f.: 1 / ((1+x)^2*(1+x^2)*(1+x+x^2)*(1+x+x^2+x^3+x^4)). - Colin Barker, Aug 10 2016
a(n) = -4*a(n-1) - 9*a(n-2) - 15*a(n-3) - 20*a(n-4) - 22*a(n-5) - 20*a(n-6) - 15*a(n-7) - 9*a(n-8) - 4*a(n-9) - a(n-10). - Ilya Gutkovskiy, Aug 10 2016
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PROG
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(PARI) Vec(1/((1+x)^2*(1+x^2)*(1+x+x^2)*(1+x+x^2+x^3+x^4)) + O(x^100)) \\ Colin Barker, Aug 11 2016
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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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