A385473 Expansion of e.g.f. 1/(1 - arctanh(3*x))^(1/3).
1, 1, 4, 46, 568, 10624, 218656, 5702752, 163568128, 5497133824, 201702168064, 8319367856128, 371416377318400, 18185429803469824, 955872746109276160, 54228988018125125632, 3278679608280623841280, 211600457615794941460480, 14461966051190623712051200
Offset: 0
Programs
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PARI
my(N=20, x='x+O('x^N)); Vec(serlaplace(1/(1-atanh(3*x))^(1/3)))