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A012807 sinh(sec(x)*arctan(x))=x+2/3!*x^3+40/5!*x^5+576/7!*x^7+46208/9!*x^9... 0
1, 2, 40, 576, 46208, 1293184, 309637120, 5786437632, 7315622592512, -347058934743040, 483735262691819520, -91992936989187702784, 74923051609806418739200, -28841683494637052911157248 (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: A180429 A108033 A160229 * A127186 A139747 A230133

Adjacent sequences:  A012804 A012805 A012806 * A012808 A012809 A012810

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified April 5 20:30 EDT 2020. Contains 333260 sequences. (Running on oeis4.)