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A012228 arctanh(atan(tanh(x)))=x-2/3!*x^3+24/5!*x^5-944/7!*x^7+77952/9!*x^9... 0
1, -2, 24, -944, 77952, -10623744, 2145104896, -602082207744, 224357319278592, -107165894175948800, 63836869263529082880, -46390243522547859062784, 40392288941602607862906880 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A137274 A002032 A015212 * A062029 A122551 A136524

Adjacent sequences:  A012225 A012226 A012227 * A012229 A012230 A012231

KEYWORD

sign

AUTHOR

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

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Last modified February 15 13:49 EST 2012. Contains 205810 sequences.