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%I #8 Jan 15 2018 15:03:26
%S 1,1,17,225,19745,613889,165999025,6543673313,5318503266369,
%T 97941778159361,473023280425720657,-24807619116269601823,
%U 96456947558141320688993,-18191159887705677530042623,39579539155416746718880624881,-15661645517509146973335115013919
%N arctanh(arcsin(arctan(x))) = x + 1/3!*x^3 + 17/5!*x^5 + 225/7!*x^7 + 19745/9!*x^9 + ...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
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