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

Terms

a(0) =1a(1) =1a(2) =4a(3) =10a(4) =34a(5) =100a(6) =316a(7) =964a(8) =2992a(9) =9208a(10) =28456a(11) =87760a(12) =270928a(13) =835984a(14) =2580160a(15) =7962400a(16) =24573472a(17) =75836224a(18) =234041536a(19) =722281024a(20) =2229055744a(21) =6879152512a(22) =21229965952a(23) =65518430464a(24) =202198419712a(25) =624010629376