Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Feb 24 2012 12:50:44
%S 1,-3,49,-2139,181921,-25347539,5231635473,-1498270773419,
%T 568381637171521,-275844413823596835,166680279670474243825,
%U -122705715387723016322939,108112687783657068510670305
%N arcsin(arctan(tanh(x)))=x-3/3!*x^3+49/5!*x^5-2139/7!*x^7+181921/9!*x^9...
%K sign
%O 0,2
%A Patrick Demichel (patrick.demichel(AT)hp.com)