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

Terms

a(0) =0a(1) =1a(2) =1a(3) =3a(4) =6a(5) =14a(6) =31a(7) =70a(8) =157a(9) =353a(10) =793a(11) =1782a(12) =4004a(13) =8997a(14) =20216a(15) =45425a(16) =102069a(17) =229347a(18) =515338a(19) =1157954a(20) =2601899a(21) =5846414a(22) =13136773a(23) =29518061a(24) =66326481a(25) =149034250a(26) =334876920a(27) =752461609a(28) =1690765888a(29) =3799116465