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A012679 tan(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+560/6!*x^6-39296/8!*x^8... 0
2, -16, 560, -39296, 4526848, -774871040, 184332195840, -58099536592896, 23416511012143104, -11741974762852974592, 7167152797622391013376, -5231209742433608374681600, 4498538959739976198689652736 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

CROSSREFS

Sequence in context: A121271 A013136 A013004 * A012726 A013177 A060279

Adjacent sequences:  A012676 A012677 A012678 * A012680 A012681 A012682

KEYWORD

sign

AUTHOR

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

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Last modified February 14 22:22 EST 2012. Contains 205678 sequences.