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%I #13 Mar 15 2015 11:10:36
%S 4,544,707584,3807514624,58177770225664,2030847773013704704,
%T 140503203207887919775744,17427925514250338592341622784,
%U 3597303386901777560143500698189824,1166406649834620087886383283250988580864
%N -log(cosh(x)*cos(x))=-4/4!*x^4-544/8!*x^8-707584/12!*x^12...
%p g := taylor(log(cosh(x)*cos(x)),x=0,100):q := seq(abs(coeff(g,x,4*i)*(4*i)!),i=1..15);
%t With[{nn=40},Take[-CoefficientList[Series[Log[Cosh[x]Cos[x]],{x,0,nn}],x] Range[0,nn]!,{5,-1,4}]] (* _Harvey P. Dale_, Mar 15 2015 *)
%K nonn
%O 0,1
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E More terms from _Sascha Kurz_ and _Vladeta Jovovic_, Apr 04 2002
%E Definition corrected by _Harvey P. Dale_, Mar 15 2015