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A013482 exp(cos(x)-sech(x))=1-4/4!*x^4+60/6!*x^6-824/8!*x^8+120/10!*x^10... 0
1, 0, -4, 60, -824, 120, 1331156, -151389420, 15474229936, -1609208740560, 165275248217516, -13317787644945300, -752763454703346104, 1012558531283275284360, -490748297800639153012924 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..14.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Exp[Cos[x]-Sech[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Sep 21 2019 *)

CROSSREFS

Sequence in context: A007220 A034866 A055315 * A123480 A227528 A156090

Adjacent sequences:  A013479 A013480 A013481 * A013483 A013484 A013485

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.)