Expansion of exp(tan(x))/cosh(x).

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =8a(5) =32a(6) =56a(7) =280a(8) =3968a(9) =27520a(10) =133248a(11) =1072896a(12) =13993088a(13) =137702528a(14) =1139191808a(15) =12544190464a(16) =178943504384