Expansion of (1-6*x)/(1-20*x^2).

Terms

a(0) =1a(1) =-6a(2) =20a(3) =-120a(4) =400a(5) =-2400a(6) =8000a(7) =-48000a(8) =160000a(9) =-960000a(10) =3200000a(11) =-19200000a(12) =64000000a(13) =-384000000a(14) =1280000000a(15) =-7680000000a(16) =25600000000a(17) =-153600000000a(18) =512000000000