Denominators of expansion of exp x / sin x.

Terms

a(0) =1a(1) =3a(2) =3a(3) =90a(4) =18a(5) =945a(6) =1890a(7) =12600a(8) =22680a(9) =53460a(10) =1247400a(11) =10216206000a(12) =157172400a(13) =1021620600a(14) =6129723600a(15) =534386160000a(16) =81729648000