%I A009400
%S A009400 0,1,1,3,10,65,376,2723,22800,226785,2467456,29857443,397200640,
%T A009400 5785047905,91090625536,1544546456963,28057896929280,543833037679425,
%U A009400 11198060484591616,244141035610073283,5618437516698910720
%V A009400 0,1,-1,3,-10,65,-376,2723,-22800,226785,-2467456,29857443,-397200640,
%W A009400 5785047905,-91090625536,1544546456963,-28057896929280,543833037679425,
%X A009400 -11198060484591616,244141035610073283,-5618437516698910720
%N A009400 Expansion of ln(1+tanh(x)/cos(x)).
%t A009400 Log[ 1+Tanh[ x ]/Cos[ x ] ]
%Y A009400 Sequence in context: A160921 A042705 A041014 this_sequence A004102 A072638 
               A080526
%Y A009400 Adjacent sequences: A009397 A009398 A009399 this_sequence A009401 A009402 
               A009403
%K A009400 sign,easy
%O A009400 0,4
%A A009400 R. H. Hardin (rhhardin(AT)att.net)
%E A009400 Extended with signs Mar 15 1997 by Olivier Gerard.