A012492 sech(cos(x)*arcsin(x))=1-1/2!*x^2+13/4!*x^4-325/6!*x^6+14873/8!*x^8...

1, -1, 13, -325, 14873, -1157705, 123919013, -19431568013, 3783114987057, -997881588156817, 307028543021467965, -122601833964174456533, 54600351690827520350281, -30810847280896713474456025

Offset

0,3

Links

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

Crossrefs

Sequence in context: A212733 A183803 A253458 * A296395 A183440 A296018

Adjacent sequences: A012489 A012490 A012491 * A012493 A012494 A012495

Keyword

sign

Author

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

Status

approved