%I #4 Feb 24 2012 12:51:27
%S 1,0,0,-10,840,-60870,5042180,-535134730,75998689520,-14286917494990,
%T 3407940125324860,-990760306939592050,342314173738467052200,
%U -138600427075503715528310,65139256364305112582847540
%N sech(sin(x)-tanh(x))=1-10/6!*x^6+840/8!*x^8-60870/10!*x^10...
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)