Expansion of e.g.f. 1 / (1 - x * cos(x)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =0a(5) =-55a(6) =-480a(7) =-3157a(8) =-15232a(9) =-16623a(10) =898560a(11) =16316179a(12) =194574336a(13) =1666248025a(14) =5418649600a(15) =-170157839685