A012444 exp(arctan(x)*tan(x))=1+2/2!*x^2+12/4!*x^4+280/6!*x^6+7952/8!*x^8...

1, 2, 12, 280, 7952, 532768, 30306496, 4657640832, 327222722816, 131738463674880, 2341955285781504, 10584761954697844736, -1750594656814587244544, 2213182839332047713673216

Offset

0,2

Links

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

Crossrefs

Sequence in context: A098137 A214005 A014982 * A394472 A012754 A083568

Adjacent sequences: A012441 A012442 A012443 * A012445 A012446 A012447

Keyword

sign

Author

Patrick Demichel

Status

approved