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A012191 arctanh(arctan(sin(x))) = x - 1/3!*x^3 + 9/5!*x^5 - 393/7!*x^7 + 25329/9!*x^9 - ... 0

%I

%S 1,-1,9,-393,25329,-2720433,438412857,-97949820153,29044709480289,

%T -11037393803823585,5229024617702601705,-3021459365652314206953,

%U 2091487425283069032286545,-1708553607407338796161442193

%N arctanh(arctan(sin(x))) = x - 1/3!*x^3 + 9/5!*x^5 - 393/7!*x^7 + 25329/9!*x^9 - ...

%K sign

%O 0,3

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

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Last modified February 15 20:32 EST 2019. Contains 320138 sequences. (Running on oeis4.)