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A009414 Expansion of log(1+x)*cosh(tan(x)). 0

%I

%S 0,1,-1,5,-12,89,-345,3093,-17136,178065,-1313865,15537125,-145520364,

%T 1937055977,-22215578385,330407321013,-4508998213440,74499864979361,

%U -1181547581150961,21576252384049093,-389965846387214380

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

%F a(n) ~ (n-1)! * (-1)^(n+1) * cosh(tan(1)). - _Vaclav Kotesovec_, Jan 23 2015

%t Log[ 1+x ]*Cosh[ Tan[ x ] ]

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

%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 May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)