%I A012033
%S A012033 1,1,5,13,407,30151,1142483,19202427,3747342929,722092683505,
%T A012033 76341208430549,2313301317273981,1769780901329435719,
%U A012033 628518840135423728599,125498832189487922441219
%V A012033 1,-1,5,-13,-407,30151,-1142483,19202427,3747342929,-722092683505,
%W A012033 76341208430549,-2313301317273981,-1769780901329435719,
%X A012033 628518840135423728599,-125498832189487922441219
%N A012033 sech(sin(sinh(x)))=1-1/2!*x^2+5/4!*x^4-13/6!*x^6-407/8!*x^8...
%Y A012033 Sequence in context: A067135 A122900 A145557 this_sequence A007540 A157250 
               A155185
%Y A012033 Adjacent sequences: A012030 A012031 A012032 this_sequence A012034 A012035 
               A012036
%K A012033 sign
%O A012033 0,3
%A A012033 Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)