E.g.f. 1/(1-sin(x)^3).

Terms

a(0) =1a(1) =0a(2) =0a(3) =6a(4) =0a(5) =-60a(6) =720a(7) =546a(8) =-40320a(9) =357960a(10) =1693440a(11) =-59830914a(12) =414120960a(13) =6693648780a(14) =-171958026240a(15) =666035353626