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A012086 sech(arcsin(tan(x)))=1-1/2!*x^2-7/4!*x^4-121/6!*x^6-5167/8!*x^8... 0
1, -1, -7, -121, -5167, -487441, -78804727, -18558463561, -5919443326687, -2457116797560481, -1289150916753299047, -834798631079038210201, -654139310316332313889807, -610085118687493622960844721 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

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

CROSSREFS

Sequence in context: A316730 A211103 A012103 * A074487 A192566 A322090

Adjacent sequences:  A012083 A012084 A012085 * A012087 A012088 A012089

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 18 23:31 EDT 2022. Contains 353826 sequences. (Running on oeis4.)