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

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =1a(5) =1a(6) =3a(7) =6a(8) =7a(9) =13a(10) =17a(11) =24a(12) =41a(13) =57a(14) =91a(15) =142a(16) =207a(17) =325a(18) =489a(19) =736a(20) =1137a(21) =1713a(22) =2611a(23) =3990a(24) =6039a(25) =9213a(26) =14017a(27) =21288a(28) =32441a(29) =49321