a(n)=a(n-1)+a(n-2)-a(n-4)+a(n-5).

Terms

a(0) =7a(1) =11a(2) =17a(3) =26a(4) =40a(5) =62a(6) =96a(7) =149a(8) =231a(9) =358a(10) =555a(11) =860a(12) =1333a(13) =2066a(14) =3202a(15) =4963a(16) =7692a(17) =11922a(18) =18478a(19) =28639a(20) =44388a(21) =68797a(22) =106629a(23) =165265a(24) =256145a(25) =397001a(26) =615314a(27) =953679a(28) =1478113a(29) =2290936