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A012237 arctanh(atan(atanh(x)))=x+2/3!*x^3+32/5!*x^5+1168/7!*x^7+80768/9!*x^9... 0
1, 2, 32, 1168, 80768, 8855296, 1420471296, 312821661696, 90619729117184, 33397289918332928, 15260151754256547840, 8466388564521610903552, 5606464118961336397856768, 4368144479139164180218642432 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A012198 A012114 A055929 * A012093 A012214 A012140

Adjacent sequences:  A012234 A012235 A012236 * A012238 A012239 A012240

KEYWORD

nonn

AUTHOR

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

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Last modified February 14 15:32 EST 2012. Contains 205635 sequences.