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A009711 Expansion of e.g.f.: tan(tanh(log(1+x))). 0

%I

%S 0,1,-1,2,-6,16,0,-568,7504,-78248,739080,-6314848,44072688,

%T -125928464,-3754236304,114500663552,-2264653307520,37495468333696,

%U -536284797406848,6159440282136320,-34551694794080000,-931439976890484224

%N Expansion of e.g.f.: tan(tanh(log(1+x))).

%t With[{nn=30},CoefficientList[Series[Tan[Tanh[Log[1+x]]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Aug 30 2020 *)

%K sign,easy

%O 0,4

%A _R. H. Hardin_

%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997

%E Definition clarified and previous Mathematica program replaced by _Harvey P. Dale_, Aug 30 2020

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Last modified February 1 23:45 EST 2023. Contains 359997 sequences. (Running on oeis4.)