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A012163 cos(tan(arcsinh(x)))=1-1/2!*x^2-3/4!*x^4-21/6!*x^6+185/8!*x^8... 0
1, -1, -3, -21, 185, -9641, 1668021, -192801597, 42064398961, -10576096455505, 3476312353756781, -1396500495046819941, 679259896835809126697, -392775363671591649764601 (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: A131763 A006199 A083063 * A012055 A344896 A059863

Adjacent sequences:  A012160 A012161 A012162 * A012164 A012165 A012166

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 23 00:47 EDT 2022. Contains 353959 sequences. (Running on oeis4.)