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

Terms

a(0) =1a(1) =8a(2) =42a(3) =186a(4) =755a(5) =2910a(6) =10839a(7) =39404a(8) =140673a(9) =495184a(10) =1723612a(11) =5944602a(12) =20346280a(13) =69189414a(14) =233985831a(15) =787511074a(16) =2639382314a(17) =8813359530a(18) =29332784333a(19) =97339342482a(20) =322162413585