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E.g.f.: Product_{k>=1} (1 + tanh(x^k)).
9

%I #5 Mar 21 2016 07:18:16

%S 1,1,2,10,48,336,2400,22240,220416,2496256,30286080,411725568,

%T 6004838400,94609106944,1588301524992,28577718427648,546685777182720,

%U 11027370474504192,234498341381603328,5253826506085629952,123695389756163358720,3039894623920125116416

%N E.g.f.: Product_{k>=1} (1 + tanh(x^k)).

%t nmax = 25; Range[0, nmax]! * CoefficientList[Series[Product[(1+Tanh[x^k]), {k, 1, nmax}], {x, 0, nmax}], x]

%Y Cf. A130263, A270294, A270598, A270662, A270665, A270666.

%K nonn

%O 0,3

%A _Vaclav Kotesovec_, Mar 21 2016