Expansion of log(1 + sinh(x)/exp(x)).

Terms

a(0) =0a(1) =1a(2) =-3a(3) =12a(4) =-66a(5) =480a(6) =-4368a(7) =47712a(8) =-608016a(9) =8855040a(10) =-145083648a(11) =2641216512a(12) =-52891055616