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A050398
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Exponential reversion of sequence of involutions (A000085).
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2
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1, -2, 8, -50, 434, -4864, 66996, -1095324, 20724756, -445310616, 10708301328, -284863999848, 8304979127496, -263299784899488, 9018495674420592, -331867682445078000, 13057137391032043920, -546957850901539335840
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OFFSET
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1,2
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LINKS
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FORMULA
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E.g.f. A(x) satisfies: A(x) = log(1 + x) - A(x)^2/2. - Ilya Gutkovskiy, Apr 23 2020
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PROG
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(PARI) seq(n)=Vec(serlaplace(serreverse(-1 + exp(x+x^2/2 + O(x*x^n))))) \\ Andrew Howroyd, May 06 2023
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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STATUS
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approved
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