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A013507 arctan(sec(x)-sech(x))=2/2!*x^2-118/6!*x^6+211922/10!*x^10... 0
2, -118, 211922, -2213888038, 77172528228002, -6766445807663391958, 1253992673039461505620082, -436336713858380683384599647878, 261578675637348900348123633263012162, -253097144684650665182970246742109780671798, 375502662876362862713018285073925037696964948242 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..10.

CROSSREFS

Sequence in context: A147774 A013470 A013511 * A013476 A103851 A024030

Adjacent sequences:  A013504 A013505 A013506 * A013508 A013509 A013510

KEYWORD

sign

AUTHOR

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

EXTENSIONS

More terms from N. J. A. Sloane, Dec 17 2011

STATUS

approved

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Last modified July 30 17:21 EDT 2021. Contains 346359 sequences. (Running on oeis4.)