a(n) = a(n-4) + a(n-5), with a(0)=1, a(1)=a(2)=a(3)=0, a(4)=1.

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =0a(7) =0a(8) =1a(9) =2a(10) =1a(11) =0a(12) =1a(13) =3a(14) =3a(15) =1a(16) =1a(17) =4a(18) =6a(19) =4a(20) =2a(21) =5a(22) =10a(23) =10a(24) =6a(25) =7a(26) =15a(27) =20a(28) =16a(29) =13