Expansion of g.f.: x^4/((1-x)*(1-x^2)^2*(1-x^3)).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =3a(7) =4a(8) =7a(9) =9a(10) =14a(11) =17a(12) =24a(13) =29a(14) =38a(15) =45a(16) =57a(17) =66a(18) =81a(19) =93a(20) =111a(21) =126a(22) =148a(23) =166a(24) =192a(25) =214a(26) =244a(27) =270a(28) =305a(29) =335