Expansion of (1+x^2-x^3)/(1-x)^4.

Terms

a(0) =1a(1) =4a(2) =11a(3) =23a(4) =41a(5) =66a(6) =99a(7) =141a(8) =193a(9) =256a(10) =331a(11) =419a(12) =521a(13) =638a(14) =771a(15) =921a(16) =1089a(17) =1276a(18) =1483a(19) =1711a(20) =1961a(21) =2234a(22) =2531a(23) =2853a(24) =3201a(25) =3576a(26) =3979a(27) =4411a(28) =4873a(29) =5366