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A012444 exp(arctan(x)*tan(x))=1+2/2!*x^2+12/4!*x^4+280/6!*x^6+7952/8!*x^8... 0
1, 2, 12, 280, 7952, 532768, 30306496, 4657640832, 327222722816, 131738463674880, 2341955285781504, 10584761954697844736, -1750594656814587244544, 2213182839332047713673216 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A098137 A214005 A014982 * A012754 A083568 A003121

Adjacent sequences:  A012441 A012442 A012443 * A012445 A012446 A012447

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 26 20:51 EDT 2022. Contains 354092 sequences. (Running on oeis4.)