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

Terms

a(0) =1a(1) =4a(2) =15a(3) =56a(4) =207a(5) =764a(6) =2819a(7) =10400a(8) =38367a(9) =141540a(10) =522155a(11) =1926280a(12) =7106231a(13) =26215564a(14) =96711715a(15) =356778736a(16) =1316190767a(17) =4855553204a(18) =17912598619a(19) =66081283800a(20) =243780155047a(21) =899328229980