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A013481 sech(cos(x)-cosh(x)) = 1-12/4!*x^4+8288/8!*x^8-39475392/12!*x^12... 0
1, -12, 8288, -39475392, 689369608448, -32038788679636992, 3265606511334528831488, -641363922266872095050022912 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..7.

CROSSREFS

Sequence in context: A201493 A009173 A012531 * A013513 A013480 A107254

Adjacent sequences:  A013478 A013479 A013480 * A013482 A013483 A013484

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 1 14:10 EST 2021. Contains 349430 sequences. (Running on oeis4.)