%I A012810
%S A012810 1,3,73,2779,260177,32853491,6787498521,1803655970635,
%T A012810 660549566885793,299826162055728355,172107541834064358121,
%U A012810 118707937911469881769147,98574741929922225569568241
%N A012810 arctanh(sec(x)*atan(x))=x+3/3!*x^3+73/5!*x^5+2779/7!*x^7...
%Y A012810 Sequence in context: A054689 A060883 A093165 this_sequence A020517 A119017 
               A002667
%Y A012810 Adjacent sequences: A012807 A012808 A012809 this_sequence A012811 A012812 
               A012813
%K A012810 nonn
%O A012810 0,2
%A A012810 Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)