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A012565 sech(sinh(x)*arctan(x))=1-12/4!*x^4+120/6!*x^6+1680/8!*x^8... 0
1, 0, -12, 120, 1680, -4800, -20091456, 2552065152, -264925689600, 68708953577472, -29508519541947392, 12189637912025356288, -5505843502429896863744, 3137663619884947867484160 (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: A120585 A239188 A200163 * A012621 A102341 A174561

Adjacent sequences:  A012562 A012563 A012564 * A012566 A012567 A012568

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified March 18 19:58 EDT 2019. Contains 321293 sequences. (Running on oeis4.)