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A328488
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Expansion of e.g.f. 1 / (2 - exp(x * exp(x))).
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0
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1, 1, 5, 34, 307, 3456, 46659, 734882, 13227995, 267871036, 6027206803, 149176155030, 4027831914099, 117816299188472, 3711283196035523, 125258162280991858, 4509378597919760779, 172486973301491042964, 6985853719202139488211, 298650859698906574479278
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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(0) = 1; a(n) = Sum_{k=1..n} binomial(n,k) * A000248(k) * a(n-k).
a(n) ~ n! / (2*log(2) * (1 + LambertW(log(2))) * LambertW(log(2))^n). - Vaclav Kotesovec, Oct 17 2019
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MATHEMATICA
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nmax = 19; CoefficientList[Series[1/(2 - Exp[x Exp[x]]), {x, 0, nmax}], x] Range[0, nmax]!
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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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