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

Terms

a(0) =1a(1) =3a(2) =7a(3) =12a(4) =18a(5) =26a(6) =35a(7) =45a(8) =57a(9) =70a(10) =84a(11) =100a(12) =117a(13) =135a(14) =155a(15) =176a(16) =198a(17) =222a(18) =247a(19) =273a(20) =301a(21) =330a(22) =360a(23) =392a(24) =425a(25) =459a(26) =495a(27) =532a(28) =570a(29) =610