Expansion of e.g.f: log(1+x)/cosh(tanh(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-1a(4) =0a(5) =69a(6) =-225a(7) =-1653a(8) =3976a(9) =187401a(10) =-965385a(11) =-14516745a(12) =61266744a(13) =3032650893a(14) =-21187300953a(15) =-491788726653