%I #4 Feb 24 2012 12:50:40

%S 1,2,24,888,68352,8853888,1724221056,470304668928,171029448056832,

%T 79950698284462080,46709069479002931200,33347332565041919950848,

%U 28565775294718770340331520,28915860353300526164581613568

%N arcsinh(arcsin(tan(x)))=x+2/3!*x^3+24/5!*x^5+888/7!*x^7+68352/9!*x^9...

%K nonn

%O 0,2

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