Expansion of (1-5x+40x^2)/((1-5x)(1+5x)).

Terms

a(0) =1a(1) =-5a(2) =65a(3) =-125a(4) =1625a(5) =-3125a(6) =40625a(7) =-78125a(8) =1015625a(9) =-1953125a(10) =25390625a(11) =-48828125a(12) =634765625a(13) =-1220703125a(14) =15869140625a(15) =-30517578125a(16) =396728515625a(17) =-762939453125