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A013507 arctan(sec(x)-sech(x))=2/2!*x^2-118/6!*x^6+211922/10!*x^10... 0

%I

%S 2,-118,211922,-2213888038,77172528228002,-6766445807663391958,

%T 1253992673039461505620082,-436336713858380683384599647878,

%U 261578675637348900348123633263012162,-253097144684650665182970246742109780671798,375502662876362862713018285073925037696964948242

%N arctan(sec(x)-sech(x))=2/2!*x^2-118/6!*x^6+211922/10!*x^10...

%K sign

%O 0,1

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

%E More terms from _N. J. A. Sloane_, Dec 17 2011

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Last modified September 24 15:40 EDT 2021. Contains 347643 sequences. (Running on oeis4.)