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A013001 cos(arctan(x)+tan(x))=1-4/2!*x^2+16/4!*x^4-544/6!*x^6+25344/8!*x^8... 0
1, -4, 16, -544, 25344, -1920384, 246359040, -39508168704, 9120978370560, -2587275558617088, 939278027083448320, -411971792033339539456, 217927272725489369743360, -135949730585003375068184576 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..13.

CROSSREFS

Sequence in context: A013138 A262546 A013006 * A218644 A013179 A144177

Adjacent sequences:  A012998 A012999 A013000 * A013002 A013003 A013004

KEYWORD

sign

AUTHOR

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

STATUS

approved

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Last modified November 28 19:30 EST 2021. Contains 349415 sequences. (Running on oeis4.)