%I A009769
%S A009769 1,0,4,24,96,0,5760,80640,645120,0,116121600,2554675200,30656102400,0,
%T A009769 11158821273600,334764638208000,5356234211328000,0,
%U A009769 3278015337332736000,124564582818643968000,2491291656372879360000,0
%V A009769 1,0,-4,24,-96,0,5760,-80640,645120,0,-116121600,2554675200,-30656102400,
               0,
%W A009769 11158821273600,-334764638208000,5356234211328000,0,
%X A009769 -3278015337332736000,124564582818643968000,-2491291656372879360000,0
%N A009769 Expansion of tanh(ln(1+1/x)).
%t A009769 Tanh[ Log[ 1+1/x ] ]
%Y A009769 Sequence in context: A026967 A026977 A026952 this_sequence A119878 A054603 
               A100381
%Y A009769 Adjacent sequences: A009766 A009767 A009768 this_sequence A009770 A009771 
               A009772
%K A009769 sign,easy
%O A009769 0,3
%A A009769 R. H. Hardin (rhhardin(AT)att.net)
%E A009769 Extended with signs Mar 15 1997 by Olivier Gerard.