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A009386 Expansion of log(1+tanh(tan(x))). 0

%I #13 Jun 22 2015 22:27:54

%S 0,1,-1,2,-6,16,-72,272,-1456,7936,-47104,353792,-2390784,22368256,

%T -180612096,1903757312,-18625189888,209865342976,-2431403622400,

%U 29088885112832,-384624656646144,4951498053124096,-72343735465672704

%N Expansion of log(1+tanh(tan(x))).

%t Log[ 1+Tanh[ Tan[ x ] ] ]

%t CoefficientList[Series[Log[1 + Tanh[Tan[x]]], {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Jan 23 2015 *)

%Y Cf. A000182.

%K sign,easy

%O 0,4

%A _R. H. Hardin_

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

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)