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%I #7 Mar 30 2012 16:45:52
%S 1,-1,-7,-73,-239,95311,12793417,1502683335,172513245857,
%T 17253776069663,455220048522521,-596864160295290537,
%U -305119961556198266191,-109834061252143977404561
%N sech(tan(sinh(x)))=1-1/2!*x^2-7/4!*x^4-73/6!*x^6-239/8!*x^8...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E More terms from _N. J. A. Sloane_, Aug 27 2006
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