A013386 - OEIS

%I #4 Feb 24 2012 12:51:27

%S 1,0,0,10,-840,60870,-4888180,451050730,-44615337520,3756525622990,

%T 121350724409140,-252176627984091950,129656734144811047800,

%U -57182907798391521511690,24201188340561567892562460

%N sec(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)