Expansion of (1+4*x^2) / (1-5*x+4*x^2-4*x^3).

Terms

a(0) =1a(1) =5a(2) =25a(3) =109a(4) =465a(5) =1989a(6) =8521a(7) =36509a(8) =156417a(9) =670133a(10) =2871033a(11) =12300301a(12) =52697905a(13) =225772453a(14) =967271849a(15) =4144061053a(16) =17754307681a(17) =76064381589a(18) =325880921433