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A012818 arctanh(sec(x)*sinh(x))=x+6/3!*x^3+140/5!*x^5+8456/7!*x^7... 0
1, 6, 140, 8456, 957840, 174293856, 46514037440, 17115342333056, 8304761365213440, 5137820023434733056, 3947233200665413667840, 3686931444647916864505856, 4114664615209642258282352640 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A193876 A193185 A012785 * A078450 A193502 A059488

Adjacent sequences:  A012815 A012816 A012817 * A012819 A012820 A012821

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 12:41 EST 2012. Contains 205909 sequences.