%I A012684
%S A012684 2,16,80,14464,1924352,182456320,4821633024,5022496751616,
%T A012684 2274499602284544,641508042469015552,58440162971714846720,
%U A012684 91048038738283980652544,93320295604487977397387264
%V A012684 2,-16,80,14464,-1924352,182456320,-4821633024,-5022496751616,
%W A012684 2274499602284544,-641508042469015552,58440162971714846720,
%X A012684 91048038738283980652544,-93320295604487977397387264
%N A012684 tanh(tanh(x)*arctan(x))=2/2!*x^2-16/4!*x^4+80/6!*x^6+14464/8!*x^8...
%Y A012684 Sequence in context: A028336 A045905 A012680 this_sequence A053587 A052346 
               A071893
%Y A012684 Adjacent sequences: A012681 A012682 A012683 this_sequence A012685 A012686 
               A012687
%K A012684 sign
%O A012684 0,1
%A A012684 Patrick Demichel (dml(AT)hpfrcu03.france.hp.com)