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

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =14a(5) =31a(6) =70a(7) =157a(8) =353a(9) =793a(10) =1782a(11) =4004a(12) =8997a(13) =20216a(14) =45425a(15) =102069a(16) =229347a(17) =515338a(18) =1157954a(19) =2601899a(20) =5846414a(21) =13136773a(22) =29518061a(23) =66326481a(24) =149034250a(25) =334876920a(26) =752461609a(27) =1690765888a(28) =3799116465a(29) =8536537209