Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Feb 24 2012 12:50:40
%S 1,-2,32,-1224,89984,-10705408,1889967232,-464238999808,
%T 151661217091584,-63641246944645120,33381024310383640576,
%U -21408234533329528127488,16485197581627921671815168
%N arcsinh(arcsin(arctan(x)))=x-2/3!*x^3+32/5!*x^5-1224/7!*x^7+89984/9!*x^9...
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)