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

Terms

a(0) =1a(1) =-3a(2) =7a(3) =-18a(4) =46a(5) =-117a(6) =298a(7) =-759a(8) =1933a(9) =-4923a(10) =12538a(11) =-31932a(12) =81325a(13) =-207120a(14) =527497a(15) =-1343439a(16) =3421495a(17) =-8713926a(18) =22192786a(19) =-56520993a(20) =143948698a(21) =-366611175a(22) =933692041a(23) =-2377943955a(24) =6056191126a(25) =-15424018248a(26) =39282171577a(27) =-100044552528a(28) =254795294881a(29) =-648917313867