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A012507
sec(cos(x)*arctan(x))=1+1/2!*x^2-15/4!*x^4+105/6!*x^6+8897/8!*x^8...
0
1, 1, -15, 105, 8897, -664815, -4523343, 8138992953, -972054629887, -115219461350367, 72803853486273265, -6666182957939643127, -7549270905441932464191, 4123382958180269131627825
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..13.
CROSSREFS
Sequence in context:
A165892
A349169
A077261
*
A143727
A231327
A041426
Adjacent sequences:
A012504
A012505
A012506
*
A012508
A012509
A012510
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved
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Last modified September 13 20:16 EDT 2024. Contains 375910 sequences. (Running on oeis4.)