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A013505 arcsin(sec(x)-sech(x))=2/2!*x^2+242/6!*x^6+680642/10!*x^10... 0
2, 242, 680642, 12295286642, 793097630442242, 133559779986589891442, 48615807873566074448898242, 33724812804150581105792438246642, 40740665803925610662412399036224240642, 80080558510702094594473104537545729044704242, 242897198718040825682993782394774029906856140981442 (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: A309037 A013509 A013472 * A013478 A049333 A140162

Adjacent sequences:  A013502 A013503 A013504 * A013506 A013507 A013508

KEYWORD

nonn

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 April 8 19:37 EDT 2020. Contains 333323 sequences. (Running on oeis4.)