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A012544 sech(sinh(x)*arcsin(x))=1-12/4!*x^4-240/6!*x^6+1680/8!*x^8... 0
1, 0, -12, -240, 1680, 660480, 39530304, -3855231744, -1466146656000, -147651751649280, 43245441015313408, 21785411128189063168, 453349606338812022784, -4374564365537166405795840 (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: A012351 A189883 A033469 * A009052 A213449 A012303

Adjacent sequences:  A012541 A012542 A012543 * A012545 A012546 A012547

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified May 21 00:41 EDT 2019. Contains 323427 sequences. (Running on oeis4.)