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A012236 tanh(arctan(atanh(x)))=x-2/3!*x^3+24/5!*x^5-496/7!*x^7+24192/9!*x^9... 0
1, -2, 24, -496, 24192, -1246464, 150408192, -12132673536, 3380973895680, -253363927449600, 217523969745223680, 4682388187242823680, 35388810383588767825920, 8821171867345211810119680 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A003102 A052712 A133413 * A186414 A187658 A138450

Adjacent sequences:  A012233 A012234 A012235 * A012237 A012238 A012239

KEYWORD

sign

AUTHOR

Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)

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Last modified February 16 11:47 EST 2012. Contains 205907 sequences.