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

Terms

a(0) =1a(1) =1a(2) =4a(3) =6a(4) =20a(5) =36a(6) =104a(7) =208a(8) =552a(9) =1176a(10) =2968a(11) =6568a(12) =16088a(13) =36424a(14) =87640a(15) =201160a(16) =478872a(17) =1108232a(18) =2621400a(19) =6096584a(20) =14365720a(21) =33509256a(22) =78778968a(23) =184084552a(24) =432181912a(25) =1010962184a(26) =2371520728a(27) =5551005640a(28) =13015164184a(29) =30476145288