A012689 arctan(tanh(x)*cos(x))=x-7/3!*x^3+165/5!*x^5-10827/7!*x^7...

1, -7, 165, -10827, 1316585, -257028847, 73616009805, -29070305745267, 15137914082015825, -10050622525103392087, 8286707825575406550645, -8306718039292070745761307, 9948875920938941746670110265

Offset

0,2

Links

Table of n, a(n) for n=0..12.

Crossrefs

Sequence in context: A160241 A020998 A012504 * A098632 A192275 A009807

Adjacent sequences: A012686 A012687 A012688 * A012690 A012691 A012692

Keyword

sign

Author

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

Status

approved