G.f.: 1/(1-x-x^2-2*x^3-5*x^4).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =14a(5) =28a(6) =62a(7) =143a(8) =331a(9) =738a(10) =1665a(11) =3780a(12) =8576a(13) =19376a(14) =43837a(15) =99265a(16) =224734a(17) =508553a(18) =1151002a(19) =2605348a(20) =5897126a(21) =13347243a(22) =30210075a(23) =68378310a(24) =154768501a(25) =350303176a(26) =792878672a(27) =1794610400a(28) =4061937929a(29) =9193821553