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

Terms

a(0) =3a(1) =8a(2) =9a(3) =23a(4) =24a(5) =61a(6) =63a(7) =160a(8) =165a(9) =419a(10) =432a(11) =1097a(12) =1131a(13) =2872a(14) =2961a(15) =7519a(16) =7752a(17) =19685a(18) =20295a(19) =51536a(20) =53133a(21) =134923a(22) =139104a(23) =353233a(24) =364179a(25) =924776a(26) =953433a(27) =2421095a(28) =2496120a(29) =6338509