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

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =9a(5) =16a(6) =29a(7) =53a(8) =96a(9) =174a(10) =315a(11) =571a(12) =1035a(13) =1876a(14) =3400a(15) =6162a(16) =11168a(17) =20241a(18) =36685a(19) =66488a(20) =120503a(21) =218400a(22) =395829a(23) =717402a(24) =1300222a(25) =2356527a(26) =4270978a(27) =7740736a(28) =14029338a(29) =25426823