A012058 - OEIS

%I #4 Feb 24 2012 12:50:39

%S 1,-1,1,-57,-3167,-362737,-56653791,-11948396137,-3257340575039,

%T -1115453379837153,-468755833785218879,-237209057387611844761,

%U -142289210803187916748959,-99838786688751535495417297

%N tanh(sin(arctanh(x)))=x-1/3!*x^3+1/5!*x^5-57/7!*x^7-3167/9!*x^9...

%K sign

%O 0,4

%A Patrick Demichel (patrick.demichel(AT)hp.com)