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A012218 tanh(arctan(arcsinh(x)))=x-5/3!*x^3+129/5!*x^5-7741/7!*x^7... 0
1, -5, 129, -7741, 830529, -139115349, 33466193409, -10924199283981, 4643317555286145, -2490727724722757925, 1645111995753399461505, -1311624218654589461390685, 1241813393715548870981284545 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A277259 A230303 A094074 * A012136 A012022 A012176

Adjacent sequences: A012215 A012216 A012217 * A012219 A012220 A012221

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 6 12:26 EST 2022. Contains 358634 sequences. (Running on oeis4.)