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A012180 tanh(tan(arctanh(x)))=x+2/3!*x^3+16/5!*x^5+48/7!*x^7-29696/9!*x^9... 0
1, 2, 16, 48, -29696, -6049792, -1262426112, -308569372672, -89297625350144, -30123113337716736, -11520007513318621184, -4775431672418431664128, -1952929261585732032528384, -545214673336986589066166272 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A223219 A063721 A232209 * A058376 A295906 A120948

Adjacent sequences:  A012177 A012178 A012179 * A012181 A012182 A012183

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)