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%I #4 May 13 2020 19:00:19
%S 1,2,7,32,141,-48,-20509,-572416,-13236455,-290711040,-6196120193,
%T -125279895552,-2200506714587,-21844509804544,731664799971163,
%U 69257460487553024,3772508483052129329,174474102931077464064,7365599642083503837175,286164434343334028247040
%N E.g.f. A(x) satisfies: A(x) = tanh(x * exp(A(x))).
%F E.g.f.: series reversion of arctanh(x) / exp(x).
%t nmax = 20; CoefficientList[InverseSeries[Series[ArcTanh[x]/Exp[x], {x, 0, nmax}], x], x] Range[0, nmax]! // Rest
%Y Cf. A227463, A227465.
%K sign
%O 1,2
%A _Ilya Gutkovskiy_, May 13 2020