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Search: id:A012209
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A012209 arctanh(atan(atan(x)))=x-2/3!*x^3+32/5!*x^5-1392/7!*x^7+118400/9!*x^9... +0
1
1, -2, 32, -1392, 118400, -16678144, 3517084672, -1037502889984, 407811782836224, -205957880207835136, 129921324821854289920, -100089923129501690626048, 92456928301505596639674368 (list; graph; listen)
OFFSET

0,2
CROSSREFS

Adjacent sequences: A012206 A012207 A012208 this_sequence A012210 A012211 A012212

Sequence in context: A012093 A012214 A012140 this_sequence A129348 A087084 A088386

KEYWORD

sign

AUTHOR

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

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Last modified October 10 20:39 EDT 2008. Contains 144831 sequences.

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