a(n) = a(n-1) + a(n-4), starting 1,1,1,3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =5a(6) =6a(7) =9a(8) =13a(9) =18a(10) =24a(11) =33a(12) =46a(13) =64a(14) =88a(15) =121a(16) =167a(17) =231a(18) =319a(19) =440a(20) =607a(21) =838a(22) =1157a(23) =1597a(24) =2204a(25) =3042a(26) =4199a(27) =5796a(28) =8000a(29) =11042