a(n) = a(n-1) + Sum_{0<k<=n/5} a(n-5k) with a(0)=1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =3a(7) =4a(8) =5a(9) =6a(10) =9a(11) =13a(12) =18a(13) =24a(14) =31a(15) =43a(16) =60a(17) =83a(18) =113a(19) =151a(20) =206a(21) =283a(22) =389a(23) =532a(24) =721a(25) =982a(26) =1342a(27) =1837a(28) =2512a(29) =3422