Expansion of 4*x^2/(1 - x - 9*x^2 + x^3).

Terms

a(0) =0a(1) =0a(2) =4a(3) =4a(4) =40a(5) =72a(6) =428a(7) =1036a(8) =4816a(9) =13712a(10) =56020a(11) =174612a(12) =665080a(13) =2180568a(14) =7991676a(15) =26951708a(16) =96696224a(17) =331269920a(18) =1174584228a(19) =4059317284a(20) =14299305416a(21) =49658576744a(22) =174293008204a(23) =606920893484