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A305323
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Expansion of e.g.f. 1/(1 + log(1 + log(1 - x))).
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4
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1, 1, 4, 25, 211, 2238, 28560, 425808, 7261200, 139367278, 2973006344, 69775267186, 1786673529746, 49565881948204, 1480900541242572, 47407364553205448, 1618838460981098680, 58734896900587841824, 2256402484187691207152, 91499934912942249975504, 3905739517580787866827872
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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) ~ n! / (exp(2 - exp(-1)) * (1 - exp(exp(-1) - 1))^(n+1)). - Vaclav Kotesovec, May 31 2018
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EXAMPLE
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E.g.f.: A(x) = 1 + x + 4*x^2/2! + 25*x^3/3! + 211*x^4/4! + 2238*x^5/5! + 28560*x^6/6! + ...
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MAPLE
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S:= series(1/(1+log(1+log(1-x))), x, 31):
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MATHEMATICA
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nmax = 20; CoefficientList[Series[1/(1 + Log[1 + Log[1 - x]]), {x, 0, nmax}], x] Range[0, nmax]!
a[0] = 1; a[n_] := a[n] = Sum[Sum[(j - 1)! Abs[StirlingS1[k, j]], {j, 1, k}] a[n - k]/k!, {k, 1, n}]; Table[n! a[n], {n, 0, 20}]
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PROG
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(PARI) x = 'x + O('x^30); Vec(serlaplace(1/(1 + log(1 + log(1 - x))))) \\ Michel Marcus, May 31 2018
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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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