The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #6 Dec 15 2024 16:23:36
%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...
%t With[{nn=30},Take[CoefficientList[Series[Sec[Sin[x]-Tanh[x]],{x,0,nn}],x] Range[0,nn]!,{1,-1,2}]] (* _Harvey P. Dale_, Dec 15 2024 *)
%K sign
%O 0,4
%A Patrick Demichel (patrick.demichel(AT)hp.com)