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

Terms

a(0) =0a(1) =0a(2) =1a(3) =0a(4) =1a(5) =2a(6) =1a(7) =4a(8) =5a(9) =6a(10) =13a(11) =16a(12) =25a(13) =42a(14) =57a(15) =92a(16) =141a(17) =206a(18) =325a(19) =488a(20) =737a(21) =1138a(22) =1713a(23) =2612a(24) =3989a(25) =6038a(26) =9213a(27) =14016a(28) =21289a(29) =32442