%I #4 Feb 24 2012 12:50:42
%S 1,-1,-3,-21,185,-9641,1668021,-192801597,42064398961,-10576096455505,
%T 3476312353756781,-1396500495046819941,679259896835809126697,
%U -392775363671591649764601
%N cos(tan(arcsinh(x)))=1-1/2!*x^2-3/4!*x^4-21/6!*x^6+185/8!*x^8...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)