Expansion of exp(tanh(x))/exp(x).

Terms

a(0) =1a(1) =0a(2) =0a(3) =-2a(4) =0a(5) =16a(6) =40a(7) =-272a(8) =-1792a(9) =5696a(10) =97536a(11) =-58112a(12) =-6692224a(13) =-14752256a(14) =566971392a(15) =3293370624a(16) =-57170149376a(17) =-629890867200