a(n)=a(n-1)+a(n-4).

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =5a(5) =6a(6) =7a(7) =11a(8) =16a(9) =22a(10) =29a(11) =40a(12) =56a(13) =78a(14) =107a(15) =147a(16) =203a(17) =281a(18) =388a(19) =535a(20) =738a(21) =1019a(22) =1407a(23) =1942a(24) =2680a(25) =3699a(26) =5106a(27) =7048a(28) =9728a(29) =13427