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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
1, -1, 9, -393, 25329, -2720433, 438412857, -97949820153, 29044709480289, -11037393803823585, 5229024617702601705, -3021459365652314206953, 2091487425283069032286545, -1708553607407338796161442193 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A124042 A297738 A225988 * A012078 A332139 A266924

Adjacent sequences:  A012188 A012189 A012190 * A012192 A012193 A012194

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 4 12:55 EST 2021. Contains 349525 sequences. (Running on oeis4.)