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A370908
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Expansion of e.g.f. (1/x) * Series_Reversion( 4*x/(3 + exp(4*x)) ).
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1
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1, 1, 6, 58, 824, 15576, 368560, 10494352, 349680000, 13354956160, 575343613184, 27606884967168, 1460295317318656, 84429863673895936, 5297505756426098688, 358520710389920598016, 26033795963713021116416, 2019060825791610516504576
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) = 1/(4*(n+1)) * Sum_{k=0..n+1} 3^(n+1-k) * k^n * binomial(n+1,k).
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PROG
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(PARI) my(N=20, x='x+O('x^N)); Vec(serlaplace(serreverse(4*x/(3+exp(4*x)))/x))
(PARI) a(n) = sum(k=0, n+1, 3^(n+1-k)*k^n*binomial(n+1, k))/(4*(n+1));
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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