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A012453
cosh(arctan(x)*tan(x))=1+12/4!*x^4+10640/8!*x^8-241920/10!*x^10...
0
1, 0, 12, 0, 10640, -241920, 75278016, -7539051520, 2338162028800, -550757434515456, 220140383085120512, -89874455859710427136, 48809245689148176896000, -29578326579043904251166720
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..13.
CROSSREFS
Sequence in context:
A012339
A012448
A012338
*
A284453
A012454
A322732
Adjacent sequences:
A012450
A012451
A012452
*
A012454
A012455
A012456
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved
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Last modified September 2 11:00 EDT 2024. Contains 375613 sequences. (Running on oeis4.)