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%I #13 Jun 23 2015 21:44:02
%S 0,1,-1,-1,0,49,-165,-393,-504,70785,-434385,-517265,-12647976,
%T 654552625,-6276987717,18362076327,-636272644560,22683808563841,
%U -312594994151361,2817355930176479,-72112751626318640,2222078368780722865
%N Expansion of log(1+x)/cosh(sin(x)).
%F a(n) ~ (n-1)! * (-1)^(n+1) / cosh(sin(1)). - _Vaclav Kotesovec_, Jan 23 2015
%t Log[ 1+x ]/Cosh[ Sin[ x ] ]
%t CoefficientList[Series[Log[1 + x]*Sech[Sin[x]], {x, 0, 20}], x] * Range[0, 20]! (* _Vaclav Kotesovec_, Jan 23 2015 *)
%K sign,easy
%O 0,6
%A _R. H. Hardin_
%E Extended with signs by _Olivier GĂ©rard_, Mar 15 1997