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

Terms

a(0) =1a(1) =8a(2) =42a(3) =184a(4) =731a(5) =2736a(6) =9844a(7) =34448a(8) =118101a(9) =398584a(10) =1328606a(11) =4384392a(12) =14348911a(13) =46633952a(14) =150663528a(15) =484275616a(16) =1549681961a(17) =4939611240a(18) =15690529810a(19) =49686677720a(20) =156905298051a(21) =494251688848