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

Terms

a(0) =1a(1) =4a(2) =17a(3) =76a(4) =337a(5) =1496a(6) =6641a(7) =29480a(8) =130865a(9) =580924a(10) =2578785a(11) =11447508a(12) =50816737a(13) =225581040a(14) =1001378849a(15) =4445229968a(16) =19732860833a(17) =87596322228a(18) =388849631729