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

Terms

a(0) =0a(1) =0a(2) =2a(3) =4a(4) =12a(5) =32a(6) =88a(7) =240a(8) =656a(9) =1792a(10) =4896a(11) =13376a(12) =36544a(13) =99840a(14) =272768a(15) =745216a(16) =2035968a(17) =5562368a(18) =15196672a(19) =41518080a(20) =113429504a(21) =309895168a(22) =846649344a(23) =2313089024a(24) =6319476736a(25) =17265131520a(26) =47169216512a(27) =128868696064a(28) =352075825152a(29) =961889042432