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

Terms

a(0) =1a(1) =4a(2) =15a(3) =57a(4) =214a(5) =802a(6) =3006a(7) =11265a(8) =42214a(9) =158191a(10) =592797a(11) =2221416a(12) =8324416a(13) =31194472a(14) =116896497a(15) =438051684a(16) =1641531463a(17) =6151387249a(18) =23051379726a(19) =86381508066a(20) =323701445398