A012453 cosh(arctan(x)*tan(x))=1+12/4!*x^4+10640/8!*x^8-241920/10!*x^10...

1, 0, 12, 0, 10640, -241920, 75278016, -7539051520, 2338162028800, -550757434515456, 220140383085120512, -89874455859710427136, 48809245689148176896000, -29578326579043904251166720

Offset

0,3

Links

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

Crossrefs

Sequence in context: A012339 A012448 A012338 * A284453 A012454 A322732

Adjacent sequences: A012450 A012451 A012452 * A012454 A012455 A012456

Keyword

sign

Author

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

Status

approved