%I A012790
%S A012790 1,2,20,1104,23728,2048224,394518592,28921612032,3968669081344,
%T A012790 2038929577444864,347998546570798080,59058720637105172480,
%U A012790 67936182152875665510400,22515279368057454566531072
%V A012790 1,2,-20,-1104,-23728,2048224,394518592,28921612032,-3968669081344,
%W A012790 -2038929577444864,-347998546570798080,59058720637105172480,
%X A012790 67936182152875665510400,22515279368057454566531072
%N A012790 tanh(sec(x)*arcsin(x))=x+2/3!*x^3-20/5!*x^5-1104/7!*x^7-23728/9!*x^9...
%Y A012790 Sequence in context: A158843 A008793 A015192 this_sequence A013144 A112359 
               A053848
%Y A012790 Adjacent sequences: A012787 A012788 A012789 this_sequence A012791 A012792 
               A012793
%K A012790 sign
%O A012790 0,2
%A A012790 Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)