%I #9 Jun 20 2021 12:46:22
%S 0,1,0,-3,12,-15,-120,1197,-6048,-255,428160,-5448003,29812992,
%T 241437105,-8332047360,104019879597,-293043130368,-17849464279935,
%U 456591699640320,-5108933510880003,-26996975653552128
%N Expansion of e.g.f. log(cosh(x) + tanh(x)).
%e x - 3/3!*x^3 + 12/4!*x^4 - 15/5!*x^5 - 120/6!*x^6 ...
%t With[{nn=20},CoefficientList[Series[Log[Cosh[x]+Tanh[x]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Jun 20 2021 *)
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E a(0)=0 inserted and title improved by _Sean A. Irvine_, Aug 01 2018
|