%I A009253
%S A009253 1,1,1,6,21,112,717,4592,38857,318208,3158329,32169984,363525789,
%T A009253 4399544320,56250039237,779244812288,11210469917713,173483433263104,
%U A009253 2783865475754737,47421793222656000,840008000833503141
%N A009253 Expansion of exp(tan(x)/cos(x)).
%t A009253 Exp[ Tan[ x ]/Cos[ x ] ]
%Y A009253 Sequence in context: A083558 A060843 A026650 this_sequence A012840 A013320 
               A056308
%Y A009253 Adjacent sequences: A009250 A009251 A009252 this_sequence A009254 A009255 
               A009256
%K A009253 nonn,easy
%O A009253 0,4
%A A009253 R. H. Hardin (rhhardin(AT)att.net)
%E A009253 Extended and signs tested Mar 15 1997 by Olivier Gerard.