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

Terms

a(0) =1a(1) =3a(2) =7a(3) =12a(4) =18a(5) =25a(6) =33a(7) =42a(8) =52a(9) =63a(10) =75a(11) =88a(12) =102a(13) =117a(14) =133a(15) =150a(16) =168a(17) =187a(18) =207a(19) =228a(20) =250a(21) =273a(22) =297a(23) =322a(24) =348a(25) =375a(26) =403a(27) =432a(28) =462a(29) =493