A012095 - OEIS

%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)