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A012828 arcsinh(sec(x)*arcsinh(x))=x+1/3!*x^3+13/5!*x^5-163/7!*x^7+12409/9!*x^9... 0
1, 1, 13, -163, 12409, -931207, 131515525, -22736601067, 5414338951025, -1621869733040399, 608306871018022013, -276781704508170478131, 150811097250449098751721, -96804685135198494755720343 (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: A133180 A090134 A087400 * A119539 A277412 A171318

Adjacent sequences:  A012825 A012826 A012827 * A012829 A012830 A012831

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified June 28 19:10 EDT 2022. Contains 354907 sequences. (Running on oeis4.)