Expansion of 1/(1-x^2(1-3x)).

Terms

a(0) =1a(1) =0a(2) =1a(3) =-3a(4) =1a(5) =-6a(6) =10a(7) =-9a(8) =28a(9) =-39a(10) =55a(11) =-123a(12) =172a(13) =-288a(14) =541a(15) =-804a(16) =1405a(17) =-2427a(18) =3817a(19) =-6642a(20) =11098a(21) =-18093a(22) =31024a(23) =-51387a(24) =85303a(25) =-144459a(26) =239464a(27) =-400368a(28) =672841a(29) =-1118760