Expansion of e.g.f. 1/(1 - sin(3*x) / 3).

Terms

a(0) =1a(1) =1a(2) =2a(3) =-3a(4) =-48a(5) =-339a(6) =-1008a(7) =10737a(8) =237312a(9) =2362041a(10) =5432832a(11) =-318158523a(12) =-7615254528a(13) =-87216236379a(14) =173049219072