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A012620 sec(arcsinh(x)*tan(x))=1+12/4!*x^4+120/6!*x^6+15120/8!*x^8... 0
1, 0, 12, 120, 15120, 640320, 143136576, 14091272832, 5105629251840, 906008454739968, 490783256100396032, 136461255865204086784, 104233836908816608661504, 41544908070600747941806080 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A012563 A012441 A012373 * A012564 A012442 A037097

Adjacent sequences:  A012617 A012618 A012619 * A012621 A012622 A012623

KEYWORD

nonn

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified May 20 10:32 EDT 2013. Contains 225458 sequences.