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A012820 sech(sec(x)*sinh(x))=1-1/2!*x^2-11/4!*x^4-37/6!*x^6+7145/8!*x^8... 0
1, -1, -11, -37, 7145, 450711, -3070179, -4923539597, -586954253103, 57287087552943, 41119408518068293, 5965331366096594059, -2749345524263504663367, -1905635088547220040309433 (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: A232976 A084018 A235874 * A162929 A116059 A100842

Adjacent sequences:  A012817 A012818 A012819 * A012821 A012822 A012823

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 26 17:16 EDT 2022. Contains 354092 sequences. (Running on oeis4.)