A012448 cos(arctan(x)*tan(x))=1-12/4!*x^4-7280/8!*x^8+241920/10!*x^10...

1, 0, -12, 0, -7280, 241920, -39796416, 5601756160, -1164660739840, 326680627961856, -107144725837171712, 45897715016709799936, -22689657885234118356992, 13649678748377009638277120

Offset

0,3

Links

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

Crossrefs

Sequence in context: A265087 A012337 A012339 * A012338 A012453 A284453

Adjacent sequences: A012445 A012446 A012447 * A012449 A012450 A012451

Keyword

sign

Author

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

Status

approved