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

Terms

a(0) =1a(1) =1a(2) =2a(3) =6a(4) =14a(5) =32a(6) =76a(7) =180a(8) =424a(9) =1000a(10) =2360a(11) =5568a(12) =13136a(13) =30992a(14) =73120a(15) =172512a(16) =407008a(17) =960256a(18) =2265536a(19) =5345088a(20) =12610688a(21) =29752448a(22) =70195072a(23) =165611520a(24) =390727936a(25) =921846016a(26) =2174915072a(27) =5131286016a(28) =12106264064a(29) =28562358272