Expansion of exp(x^2*cosec(x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =30a(5) =320a(6) =5400a(7) =119040a(8) =3432240a(9) =125927424a(10) =5594520960a(11) =302070988800