A012479 sech(cos(x)*sin(x))=1-1/2!*x^2+21/4!*x^4-717/6!*x^6+46025/8!*x^8...

1, -1, 21, -717, 46025, -4817209, 734055069, -154121194437, 42674286160913, -15062120873888497, 6601538801733818277, -3517682024725193957181, 2239550167783452398617817, -1678950113256157460626211113

Offset

0,3

Links

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

Crossrefs

Sequence in context: A056565 A187359 A009167 * A317824 A297504 A250059

Adjacent sequences: A012476 A012477 A012478 * A012480 A012481 A012482

Keyword

sign

Author

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

Status

approved