A012365 - OEIS

%I #6 Oct 21 2018 16:30:38

%S 1,0,-1,-6,-27,-60,483,9422,92393,507528,-2635609,-125548830,

%T -2109466227,-20314641204,35281684683,6713017752758,172379768794193,

%U 2531995009465104,6214077724791503,-977218995921967926

%N Expansion of e.g.f.: sech(tan(x)*exp(x))=1-1/2!*x^2-6/3!*x^3-27/4!*x^4-60/5!*x^5...

%t With[{nn=20},CoefficientList[Series[Sech[Tan[x]Exp[x]],{x,0,nn}],x] Range[0,nn]!] (* _Harvey P. Dale_, Oct 21 2018 *)

%K sign

%O 0,4

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

%E Definition clarified by _Harvey P. Dale_, Oct 21 2018