n-th derivative of sec(x)^tan(x) at x=0.

Terms

a(0) =1a(1) =0a(2) =0a(3) =3a(4) =0a(5) =30a(6) =90a(7) =588a(8) =5040a(9) =26520a(10) =325080a(11) =2158728a(12) =27731880a(13) =249259920a(14) =3181258080a(15) =36821629848a(16) =482278043520