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

Terms

a(0) =1a(1) =4a(2) =16a(3) =63a(4) =246a(5) =960a(6) =3745a(7) =14608a(8) =56980a(9) =222255a(10) =866922a(11) =3381492a(12) =13189753a(13) =51447580a(14) =200674984a(15) =782747199a(16) =3053161710a(17) =11909076696a(18) =46452209617a(19) =181190182360a(20) =706745329324