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

Terms

a(0) =0a(1) =1a(2) =-3a(3) =9a(4) =-42a(5) =285a(6) =-2358a(7) =23079a(8) =-264792a(9) =3479625a(10) =-51399978a(11) =843354699a(12) =-15223184892a(13) =299785177965