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A013055 sech(sinh(x)+tan(x))=1-4/2!*x^2+56/4!*x^4-1798/6!*x^6+107880/8!*x^8... 0
1, -4, 56, -1798, 107880, -10378106, 1464480244, -284901103638, 73088762562608, -23906588709686578, 9710588243080306892, -4795485037260052060974, 2829543191798552453252232 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

CROSSREFS

Sequence in context: A261747 A111849 A009159 * A243486 A322733 A012983

Adjacent sequences:  A013052 A013053 A013054 * A013056 A013057 A013058

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified July 8 19:20 EDT 2020. Contains 335524 sequences. (Running on oeis4.)