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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 (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: A319588 A165892 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 October 15 11:48 EDT 2018. Contains 316229 sequences. (Running on oeis4.)