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A012817 arcsinh(sec(x)*sinh(x))=x+3/3!*x^3+5/5!*x^5-217/7!*x^7+2505/9!*x^9... 0
1, 3, 5, -217, 2505, 765963, -6838195, -9335128657, 286658869905, 407628336475923, -19130907180121195, -42164783730598660297, 3124552441785986300505, 9154657902519091515622683 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A211767 A224537 A175133 * A087367 A058846 A268535

Adjacent sequences: A012814 A012815 A012816 * A012818 A012819 A012820

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified December 3 17:38 EST 2022. Contains 358535 sequences. (Running on oeis4.)