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A012005 tanh(log(cos(x)))=-1/2!*x^2-2/4!*x^4+14/6!*x^6+568/8!*x^8... 0
-1, -2, 14, 568, 9704, -229712, -35581456, -1790014592, 72312646784, 28603722780928, 3039116082823424, -154149928667313152, -135793191600734657536, -25782484156469234296832 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

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

CROSSREFS

Sequence in context: A005806 A015184 A012002 * A294353 A156172 A013036

Adjacent sequences:  A012002 A012003 A012004 * A012006 A012007 A012008

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified March 23 14:17 EDT 2019. Contains 321431 sequences. (Running on oeis4.)