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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
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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 April 25 07:07 EDT 2024. Contains 371964 sequences. (Running on oeis4.)