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sec(tan(sinh(x)))=1+1/2!*x^2+17/4!*x^4+673/6!*x^6+48929/8!*x^8...
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%I #7 Mar 30 2012 16:45:52

%S 1,1,17,673,48929,5673089,961574833,224363899425,68975480890433,

%T 27023130631305217,13143522467110047569,7770835407698957687457,

%U 5488724780305016514749281,4564763996367746354642156161

%N sec(tan(sinh(x)))=1+1/2!*x^2+17/4!*x^4+673/6!*x^6+48929/8!*x^8...

%K nonn

%O 0,3

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

%E More terms from _N. J. A. Sloane_, Aug 27 2006