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

Terms

a(0) =1a(1) =4a(2) =11a(3) =23a(4) =41a(5) =67a(6) =102a(7) =147a(8) =204a(9) =274a(10) =358a(11) =458a(12) =575a(13) =710a(14) =865a(15) =1041a(16) =1239a(17) =1461a(18) =1708a(19) =1981a(20) =2282a(21) =2612a(22) =2972a(23) =3364a(24) =3789a(25) =4248a(26) =4743a(27) =5275a(28) =5845a(29) =6455