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A012833 sech(sec(x)*arcsinh(x))=1-1/2!*x^2-3/4!*x^4-45/6!*x^6+2457/8!*x^8... 2
1, -1, -3, -45, 2457, -36825, 12566037, -1732392389, 313988548273, -92368244011185, 30231378922437805, -12317648529216417629, 6168347852710380187977, -3616136826996686827399305 (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: A283698 A163002 A117253 * A012747 A210933 A027637

Adjacent sequences:  A012830 A012831 A012832 * A012834 A012835 A012836

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified August 12 19:59 EDT 2022. Contains 356077 sequences. (Running on oeis4.)