a(0)=0, a(1)=1, a(2)=1, a(3)=1, a(n) = a(n-3) + a(n-4) for n > 3.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =3a(9) =4a(10) =4a(11) =5a(12) =7a(13) =8a(14) =9a(15) =12a(16) =15a(17) =17a(18) =21a(19) =27a(20) =32a(21) =38a(22) =48a(23) =59a(24) =70a(25) =86a(26) =107a(27) =129a(28) =156a(29) =193